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How Do I Phase a Buildout to Spend Less Cash Up Front?

📖 2,428 words🗓️ Published Jun 23, 2026

Direct Answer

The money move is simple: build only the square footage that earns revenue on day one, and defer the rest into a written, pre-priced future phase. Phasing a buildout can cut your day-one cash outlay by 40–60%. A full 6,000 sq ft restaurant or clinic buildout at $180/sq ft is $1,080,000. Open 3,500 sq ft first — kitchen, front-of-house, the rooms that bill — for roughly $630,000, and you've kept $450,000 in working capital alive through the brutal first 12 months when most tenants run out of cash and die.

The second lever is timing the spend against the landlord's money. Negotiate a tenant improvement allowance (TI) of $40–$80/sq ft, a 3–6 month rent-abatement period, and a landlord-funded warm shell so the expensive base systems (HVAC, sprinkler, restrooms, electrical service) are on the landlord's nickel — not your loan. Done right, phasing plus landlord money means your out-of-pocket day-one cash can drop from $1.08M to under $350,000.

Phase What Earns, Defer What Waits

Split your floor plan into revenue zones and someday zones:

Phase 1 = anything that bills a customer. Treatment rooms, kitchen line, retail floor, the first 6 conference rooms. Build it fully, get the certificate of occupancy, open the doors.
Phase 2 = capacity you don't need yet. Expansion seating, the second operatory, the back-office buildout, the fancy lobby finishes.
Demising matters. Have the architect design Phase 1 so it operates as a complete, code-compliant unit without Phase 2 — separate HVAC zone, its own egress, its own restroom count.

A clinic that opens 4 operatories instead of 8 spends roughly half the casework and equipment cost up front and adds chairs from cash flow, not from a loan.

Make The Landlord Pay For The Bones

The single biggest cash saver is shifting the base building work onto the landlord:

Demand a warm shell, not cold shell. Warm shell = HVAC distributed, restrooms built, sprinkler grid, electrical to the panel, demised walls done. That's $35–$55/sq ft of work off your budget.
Negotiate maximum TI allowance. In tenant-favorable submarkets $50–$100/sq ft is achievable on a 7–10 year term. TI is effectively free buildout money.
Get free rent during construction. 3–6 months of abated rent funds your fit-out — on a 5,000 sq ft @ $40/sq ft deal, 5 months abatement is ~$83,000 of saved cash.
Push the landlord to fund the long-lead items — rooftop units, electrical service upgrade, ADA restrooms — because they become the landlord's asset at lease end anyway.

Amortize, Don't Capitalize, The Rest

If you must do more work than the allowance covers, make the landlord amortize the overage into rent instead of writing a check:

Landlord-funded TI over allowance is repaid in rent at 7–9% interest — still cheaper and less dilutive than a contractor draw on your line of credit.
Equipment leasing for kitchen, dental, or medical gear preserves cash — $0 down, 48–60 month terms are standard.
Stage your contractor draws so you're paying for Phase 1 trades only, not pre-funding Phase 2 materials sitting in a warehouse.

The rule: the landlord's balance sheet and a lender's amortization schedule are cheaper than your working capital. Working capital is the only thing that keeps you alive in year one.

Time The Permits And The Trades

Phasing fails when the permit office or a long-lead item blows your schedule and you pay rent on a dark space:

Pull the Phase 1 permit as a standalone scope so a Phase 2 design question can't hold up your opening.
Order long-lead equipment first — rooftop HVAC units and switchgear run 12–20 week lead times in 2026.
Negotiate that rent commencement starts at the LATER of substantial completion or a fixed outside date, so landlord delays don't eat your free-rent runway.
Build the punch list into the GC contract with 5–10% retainage held until Phase 1 is fully signed off.

What To Put In The Lease Before You Sign

Lock the phasing economics into the lease, not a handshake:

Pre-priced Phase 2 TI — landlord commits to fund Phase 2 improvements at a set $/sq ft later.
Expansion right with fixed or capped rent on the Phase 2 footage.
Rent abatement tied to construction, not the calendar.
TI allowance disbursed on a documented draw schedule, with unused allowance convertible to free rent so you don't leave landlord money on the table.

flowchart TD A[Total Buildout $1.08M] --> B{Split the plan} B --> C["Phase 1: revenue zones 3500 sf"] B --> D["Phase 2: deferred capacity"] C --> E["Subtract TI allowance $50/sf"] E --> F[Subtract warm-shell scope to landlord] F --> G[Apply rent abatement to fit-out] G --> H["Day-one cash: under $350K"] D --> I[Fund Phase 2 from cash flow later]

flowchart LR P[Phase 1 Plan] --> Q[Standalone permit] Q --> R[Order long-lead HVAC + gear] R --> S[Build revenue zones] S --> T[CO + open + bill customers] T --> U[Fund Phase 2 from cash flow]

Related on PULSE

[How do you coach a rep to talk less and listen more on calls?](/knowledge/q13962)
[SBA 504 vs Conventional Loan: How Do I Pay Less to Buy My Building?](/knowledge/q13666)
[How do you forecast revenue when 2027 AI buying committees bid on services during the vendor evaluation phase?](/knowledge/q16612)
[Why are 40% of B2B deals stalling in the legal review phase despite AI contract analysis tools?](/knowledge/q16560)
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How to Identify Which Spaces Should Be Built in Phase 1 vs. Phase 2

The most critical decision in phasing a buildout is drawing the line between what gets built first and what waits. A common mistake is building too much "nice-to-have" space in phase one — conference rooms, extra storage, or a second break room — while starving the revenue-generating core. To avoid this, use the revenue-per-square-foot test: for every room or zone, ask "Does this space directly create income within 90 days of opening?" If the answer is no, it’s a candidate for phase two.

For a medical or dental practice, phase one includes all treatment rooms, the front desk, the waiting area, and a minimal lab or sterilization space. Phase two might hold a second wing of operatories, a larger break room, or a dedicated imaging suite. For a restaurant, phase one is the kitchen, dining room, and a small bar — phase two could be a private dining room, an expanded patio, or a second bar. For a retail store, phase one is the sales floor, a checkout counter, and a small stockroom — phase two might be a back-office expansion or a customer lounge.

A practical rule of thumb: phase one should cover 55–65% of your total square footage but generate at least 80% of your projected revenue. That imbalance is exactly what you want — it means you’re spending cash only on spaces that pay you back quickly. To validate this, run a simple 12-month cash flow projection for each phase. If phase one alone can cover its own rent, utilities, and debt service within six months of opening, you’ve drawn the line correctly. If not, trim more space into phase two.

How to Negotiate a Phasing Clause in Your Lease That Protects You

Phasing a buildout only works if your lease explicitly allows it — and if you lock in pricing for the second phase. Without a written phasing clause, your landlord could later demand higher construction costs, change the scope, or refuse to let you build phase two at all. The clause should include three key elements: timing, pricing, and scope.

First, set a commencement date for phase two that is flexible — typically 12 to 24 months after your opening date. This gives you time to see actual revenue and decide if you even need the extra space. Second, lock the construction cost per square foot for phase two to the same rate as phase one, plus a capped escalation (usually 3–5% per year for inflation). Without this, a landlord could quote you $200/sq ft for phase two when you’re ready, even if phase one was $150/sq ft. Third, define the scope of work in an exhibit attached to the lease — floor plans, finishes, and mechanicals — so there’s no ambiguity about what gets built later.

Also negotiate a right of first refusal on any adjacent space that becomes available. If your business grows faster than expected, you may want to expand into a neighboring suite instead of building phase two in your current footprint. That flexibility can save you even more cash by avoiding demolition and reconfiguration costs. Finally, include a termination option for phase two: if your business struggles after year one, you should have the right to cancel the second phase entirely without penalty. Landlords may push back on this, but it’s a reasonable ask when you’re already committing to a longer initial lease term (say, 7–10 years) in exchange for the phasing flexibility.

How to Finance Phase One Without Draining Your Operating Reserves

Even with phasing, you still need cash for the first buildout. The smartest way to preserve your own capital is to layer in tenant improvement (TI) allowances from the landlord, SBA loans, and equipment financing — in that order. Start by negotiating the highest possible TI allowance for phase one. In most markets, landlords offer $30–$60 per square foot for a 5–7 year lease, but you can push for $80–$100/sq ft if you’re signing a longer term (10+ years) or if the space has been vacant for months. That TI money covers your construction costs directly, reducing your out-of-pocket to zero for the base building work.

For the remaining gap — typically furniture, fixtures, equipment (FF&E), and soft costs like permits and design fees — use an SBA 7(a) loan if you qualify. These loans allow up to $5 million with terms up to 25 years for real estate and 10 years for equipment, and they require only 10–20% down. That means you can fund a $200,000 equipment package with just $20,000–$40,000 down, keeping the rest of your cash in the bank for payroll and inventory. Another option is equipment leasing: for items like kitchen hoods, dental chairs, or point-of-sale systems, you can often lease with $0 down and monthly payments that start 30–60 days after installation. This pushes your cash outflow even further into the future.

Avoid using credit cards or merchant cash advances for buildout costs — their interest rates (often 20–40% APR) will eat into your margins. Instead, structure a staggered payment schedule with your general contractor: 10% at signing, 30% at permit approval, 30% at rough-in, and 30% at completion. This keeps your cash in your account longer and gives you leverage if work is delayed or subpar. The goal is to walk into your opening day with at least three months of operating expenses in reserve — not counting the buildout funds. Phasing plus smart financing makes that achievable.

FAQ

What is the biggest mistake people make when phasing a buildout? The most common error is trying to build everything at once to avoid future disruption. That strategy burns cash up front and often leaves you paying for space you won’t use for months. A smarter approach is to build only revenue-generating areas first and defer the rest.

How do I negotiate a phased buildout with my landlord? Ask for a written agreement that locks in pricing and timeline for the second phase. Landlords may agree if it keeps you in the space longer. Without that written commitment, you risk higher costs later.

Will phasing my buildout increase total construction costs? It can, but usually by a modest amount — typically 5% to 15% more than a single-phase buildout. The trade-off is that you preserve cash for operations, inventory, or hiring, which often outweighs the extra cost.

How long should I wait between phases? Most tenants wait 6 to 18 months, depending on lease terms and business growth. The key is to have the second phase fully designed and permitted before you open, so you can start construction quickly when revenue allows.

Can I phase a buildout if my lease has a tenant improvement allowance? Yes, but you need to negotiate how the TI allowance is split across phases. Some landlords will release a portion for phase one and hold the rest for phase two. If not, you may need to fund phase one yourself and use the allowance later.

What parts of a buildout are best to defer? Back-office space, storage rooms, extra conference rooms, and unfinished expansion areas are ideal to phase. Avoid deferring anything that affects customer experience, safety, or code compliance — like restrooms, exits, or HVAC for occupied zones.

Sources

CBRE — Tenant Improvement Allowance and Fit-Out Cost Guides
JLL — Office and Retail Fit-Out Cost Guide (Americas)
Cushman & Wakefield — Tenant Advisory and Project Management benchmarks
NAIOP — Tenant Improvement and Development Cost research
BOMA International — base-building vs tenant-scope delivery standards
IREM — operating and capital cost benchmarks for income property
Tenant-representation brokers — TI allowance, abatement, and warm-shell negotiation norms

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![How Do I Phase a Buildout to Spend Less Cash Up Front?](https://thumbs.dreamstime.com/z/spend-save-money-texs-side-graphs-showing-expenses-going-down-savings-up-concept-financial-stability-being-266070300.jpg)

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# How Do I Phase a Buildout to Spend Less Cash Up Front?

## Direct Answer

The money move is simple: **build only the square footage that earns revenue on day one, and defer the rest into a written, pre-priced future phase.** Phasing a buildout can cut your day-one cash outlay by **40–60%.** A full **6,000 sq ft** restaurant or clinic buildout at **$180/sq ft** is **$1,080,000.** Open **3,500 sq ft** first — kitchen, front-of-house, the rooms that bill — for roughly **$630,000**, and you've kept **$450,000 in working capital** alive through the brutal first 12 months when most tenants run out of cash and die.

The second lever is timing the spend against the landlord's money. Negotiate a **tenant improvement allowance (TI) of $40–$80/sq ft**, a **3–6 month rent-abatement period**, and a **landlord-funded warm shell** so the expensive base systems (HVAC, sprinkler, restrooms, electrical service) are on the landlord's nickel — not your loan. Done right, phasing plus landlord money means your **out-of-pocket day-one cash can drop from $1.08M to under $350,000.**

## Phase What Earns, Defer What Waits

![How Do I Phase a Buildout to Spend Less Cash Up Front? — Phase What Earns, Defer What Waits](https://image.pollinations.ai/prompt/high%20quality%20editorial%20business%20professional%20office%20photograph%20illustrating%20Phase%20What%20Earns%2C%20Defer%20What%20Waits%20How%20Do%20I%20Phase%20a%20Buildout%20to%20Spend%20Less%20Cash%20%2C%20realistic%20magazine%20style%2C%20warm%20light%2C%20no%20text%2C%20no%20watermark?width=1200&height=675&nologo=true&model=flux&seed=81863)


Split your floor plan into **revenue zones** and **someday zones**:

- **Phase 1 = anything that bills a customer.** Treatment rooms, kitchen line, retail floor, the first 6 conference rooms. Build it fully, get the certificate of occupancy, open the doors.
- **Phase 2 = capacity you don't need yet.** Expansion seating, the second operatory, the back-office buildout, the fancy lobby finishes.
- **Demising matters.** Have the architect design Phase 1 so it operates as a **complete, code-compliant unit** without Phase 2 — separate HVAC zone, its own egress, its own restroom count.

A clinic that opens **4 operatories** instead of **8** spends roughly half the casework and equipment cost up front and adds chairs from **cash flow**, not from a loan.

## Make The Landlord Pay For The Bones

![How Do I Phase a Buildout to Spend Less Cash Up Front? — Make The Landlord Pay For The Bones](https://image.pollinations.ai/prompt/high%20quality%20editorial%20business%20professional%20office%20photograph%20illustrating%20Make%20The%20Landlord%20Pay%20For%20The%20Bones%20How%20Do%20I%20Phase%20a%20Buildout%20to%20Spend%20Less%20Cash%2C%20realistic%20magazine%20style%2C%20warm%20light%2C%20no%20text%2C%20no%20watermark?width=1200&height=675&nologo=true&model=flux&seed=62899)


The single biggest cash saver is shifting the base building work onto the landlord:

1. **Demand a warm shell, not cold shell.** Warm shell = **HVAC distributed, restrooms built, sprinkler grid, electrical to the panel, demised walls done.** That's **$35–$55/sq ft** of work off your budget.
2. **Negotiate maximum TI allowance.** In tenant-favorable submarkets **$50–$100/sq ft** is achievable on a **7–10 year** term. TI is effectively free buildout money.
3. **Get free rent during construction.** **3–6 months** of abated rent funds your fit-out — on a **5,000 sq ft @ $40/sq ft** deal, **5 months** abatement is **~$83,000** of saved cash.
4. **Push the landlord to fund the long-lead items** — rooftop units, electrical service upgrade, ADA restrooms — because they become the **landlord's asset** at lease end anyway.

```mermaid
flowchart TD
    A[Total Buildout $1.08M] --> B{Split the plan}
    B --> C[Phase 1: revenue zones 3500 sf]
    B --> D[Phase 2: deferred capacity]
    C --> E[Subtract TI allowance $50/sf]
    E --> F[Subtract warm-shell scope to landlord]
    F --> G[Apply rent abatement to fit-out]
    G --> H[Day-one cash: under $350K]
    D --> I[Fund Phase 2 from cash flow later]
```

## Amortize, Don't Capitalize, The Rest

![How Do I Phase a Buildout to Spend Less Cash Up Front? — Amortize, Don't Capitalize, The Rest](https://image.pollinations.ai/prompt/high%20quality%20editorial%20business%20professional%20office%20photograph%20illustrating%20Amortize%2C%20Don't%20Capitalize%2C%20The%20Rest%20How%20Do%20I%20Phase%20a%20Buildout%20to%20Spend%20Less%20Cas%2C%20realistic%20magazine%20style%2C%20warm%20light%2C%20no%20text%2C%20no%20watermark?width=1200&height=675&nologo=true&model=flux&seed=91445)


If you must do more work than the allowance covers, make the landlord **amortize the overage into rent** instead of writing a check:

- **Landlord-funded TI over allowance** is repaid in rent at **7–9% interest** — still cheaper and less dilutive than a contractor draw on your line of credit.
- **Equipment leasing** for kitchen, dental, or medical gear preserves cash — **$0 down, 48–60 month** terms are standard.
- **Stage your contractor draws** so you're paying for Phase 1 trades only, not pre-funding Phase 2 materials sitting in a warehouse.

The rule: **the landlord's balance sheet and a lender's amortization schedule are cheaper than your working capital.** Working capital is the only thing that keeps you alive in year one.

## Time The Permits And The Trades

Phasing fails when the permit office or a long-lead item blows your schedule and you pay rent on a dark space:

- **Pull the Phase 1 permit as a standalone scope** so a Phase 2 design question can't hold up your opening.
- **Order long-lead equipment first** — rooftop HVAC units and switchgear run **12–20 week** lead times in 2026.
- **Negotiate that rent commencement starts at the LATER of substantial completion or a fixed outside date**, so landlord delays don't eat your free-rent runway.
- **Build the punch list into the GC contract** with **5–10% retainage** held until Phase 1 is fully signed off.

```mermaid
flowchart LR
    P[Phase 1 Plan] --> Q[Standalone permit]
    Q --> R[Order long-lead HVAC + gear]
    R --> S[Build revenue zones]
    S --> T[CO + open + bill customers]
    T --> U[Fund Phase 2 from cash flow]
```

## What To Put In The Lease Before You Sign

Lock the phasing economics into the lease, not a handshake:

- **Pre-priced Phase 2 TI** — landlord commits to fund Phase 2 improvements at a set **$/sq ft** later.
- **Expansion right** with **fixed or capped rent** on the Phase 2 footage.
- **Rent abatement** tied to construction, not the calendar.
- **TI allowance disbursed on a documented draw schedule**, with unused allowance convertible to **free rent** so you don't leave landlord money on the table.

<!--pillar-weave-->
## Related on PULSE

- [How do you coach a rep to talk less and listen more on calls?](/knowledge/q13962)
- [SBA 504 vs Conventional Loan: How Do I Pay Less to Buy My Building?](/knowledge/q13666)
- [How do you forecast revenue when 2027 AI buying committees bid on services during the vendor evaluation phase?](/knowledge/q16612)
- [Why are 40% of B2B deals stalling in the legal review phase despite AI contract analysis tools?](/knowledge/q16560)
- [Why are 2027 generative AI proposals extending the legal review phase by 60%?](/knowledge/q16380)
- [How Do I Phase Rent to Match My Ramp-Up Revenue?](/knowledge/q13706)

## How to Identify Which Spaces Should Be Built in Phase 1 vs. Phase 2

The most critical decision in phasing a buildout is drawing the line between what gets built first and what waits. A common mistake is building too much "nice-to-have" space in phase one — conference rooms, extra storage, or a second break room — while starving the revenue-generating core. To avoid this, use the **revenue-per-square-foot test**: for every room or zone, ask "Does this space directly create income within 90 days of opening?" If the answer is no, it’s a candidate for phase two.

For a medical or dental practice, phase one includes all treatment rooms, the front desk, the waiting area, and a minimal lab or sterilization space. Phase two might hold a second wing of operatories, a larger break room, or a dedicated imaging suite. For a restaurant, phase one is the kitchen, dining room, and a small bar — phase two could be a private dining room, an expanded patio, or a second bar. For a retail store, phase one is the sales floor, a checkout counter, and a small stockroom — phase two might be a back-office expansion or a customer lounge.

A practical rule of thumb: **phase one should cover 55–65% of your total square footage** but generate at least 80% of your projected revenue. That imbalance is exactly what you want — it means you’re spending cash only on spaces that pay you back quickly. To validate this, run a simple 12-month cash flow projection for each phase. If phase one alone can cover its own rent, utilities, and debt service within six months of opening, you’ve drawn the line correctly. If not, trim more space into phase two.

## How to Negotiate a Phasing Clause in Your Lease That Protects You

Phasing a buildout only works if your lease explicitly allows it — and if you lock in pricing for the second phase. Without a written phasing clause, your landlord could later demand higher construction costs, change the scope, or refuse to let you build phase two at all. The clause should include three key elements: **timing, pricing, and scope.**

First, set a **commencement date for phase two** that is flexible — typically 12 to 24 months after your opening date. This gives you time to see actual revenue and decide if you even need the extra space. Second, **lock the construction cost per square foot** for phase two to the same rate as phase one, plus a capped escalation (usually 3–5% per year for inflation). Without this, a landlord could quote you $200/sq ft for phase two when you’re ready, even if phase one was $150/sq ft. Third, define the **scope of work** in an exhibit attached to the lease — floor plans, finishes, and mechanicals — so there’s no ambiguity about what gets built later.

Also negotiate a **right of first refusal** on any adjacent space that becomes available. If your business grows faster than expected, you may want to expand into a neighboring suite instead of building phase two in your current footprint. That flexibility can save you even more cash by avoiding demolition and reconfiguration costs. Finally, include a **termination option** for phase two: if your business struggles after year one, you should have the right to cancel the second phase entirely without penalty. Landlords may push back on this, but it’s a reasonable ask when you’re already committing to a longer initial lease term (say, 7–10 years) in exchange for the phasing flexibility.

## How to Finance Phase One Without Draining Your Operating Reserves

Even with phasing, you still need cash for the first buildout. The smartest way to preserve your own capital is to layer in **tenant improvement (TI) allowances from the landlord**, **SBA loans**, and **equipment financing** — in that order. Start by negotiating the highest possible TI allowance for phase one. In most markets, landlords offer $30–$60 per square foot for a 5–7 year lease, but you can push for $80–$100/sq ft if you’re signing a longer term (10+ years) or if the space has been vacant for months. That TI money covers your construction costs directly, reducing your out-of-pocket to zero for the base building work.

For the remaining gap — typically furniture, fixtures, equipment (FF&E), and soft costs like permits and design fees — use an **SBA 7(a) loan** if you qualify. These loans allow up to $5 million with terms up to 25 years for real estate and 10 years for equipment, and they require only 10–20% down. That means you can fund a $200,000 equipment package with just $20,000–$40,000 down, keeping the rest of your cash in the bank for payroll and inventory. Another option is **equipment leasing**: for items like kitchen hoods, dental chairs, or point-of-sale systems, you can often lease with $0 down and monthly payments that start 30–60 days after installation. This pushes your cash outflow even further into the future.

Avoid using credit cards or merchant cash advances for buildout costs — their interest rates (often 20–40% APR) will eat into your margins. Instead, structure a **staggered payment schedule** with your general contractor: 10% at signing, 30% at permit approval, 30% at rough-in, and 30% at completion. This keeps your cash in your account longer and gives you leverage if work is delayed or subpar. The goal is to walk into your opening day with at least three months of operating expenses in reserve — not counting the buildout funds. Phasing plus smart financing makes that achievable.

## FAQ

**What is the biggest mistake people make when phasing a buildout?**  
The most common error is trying to build everything at once to avoid future disruption. That strategy burns cash up front and often leaves you paying for space you won’t use for months. A smarter approach is to build only revenue-generating areas first and defer the rest.

**How do I negotiate a phased buildout with my landlord?**  
Ask for a written agreement that locks in pricing and timeline for the second phase. Landlords may agree if it keeps you in the space longer. Without that written commitment, you risk higher costs later.

**Will phasing my buildout increase total construction costs?**  
It can, but usually by a modest amount — typically 5% to 15% more than a single-phase buildout. The trade-off is that you preserve cash for operations, inventory, or hiring, which often outweighs the extra cost.

**How long should I wait between phases?**  
Most tenants wait 6 to 18 months, depending on lease terms and business growth. The key is to have the second phase fully designed and permitted before you open, so you can start construction quickly when revenue allows.

**Can I phase a buildout if my lease has a tenant improvement allowance?**  
Yes, but you need to negotiate how the TI allowance is split across phases. Some landlords will release a portion for phase one and hold the rest for phase two. If not, you may need to fund phase one yourself and use the allowance later.

**What parts of a buildout are best to defer?**  
Back-office space, storage rooms, extra conference rooms, and unfinished expansion areas are ideal to phase. Avoid deferring anything that affects customer experience, safety, or code compliance — like restrooms, exits, or HVAC for occupied zones.

## Sources

- CBRE — Tenant Improvement Allowance and Fit-Out Cost Guides
- JLL — Office and Retail Fit-Out Cost Guide (Americas)
- Cushman & Wakefield — Tenant Advisory and Project Management benchmarks
- NAIOP — Tenant Improvement and Development Cost research
- BOMA International — base-building vs tenant-scope delivery standards
- IREM — operating and capital cost benchmarks for income property
- Tenant-representation brokers — TI allowance, abatement, and warm-shell negotiation norms

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