The Developer Feasibility Pack
Type your land price, build cost, and rents into one screen and see whether a ground-up deal pencils. The model runs the sources and uses, your yield-on-cost against the market cap rate, and the residual land value, so you know the most you can pay for the dirt.
Built for developers, merchant builders, and value-add buyers moving into ground-up. It runs in Excel or Google Sheets, with ChatGPT or Claude for the reasoning. No code.
Download the pack
Want the system, not just the files?
Get the full pack once, then use the walkthrough below to see exactly what is inside and how to run it.
Get The Developer Feasibility Pack
Enter your details and the full pack downloads right away. No cost.
Who this is for
If a deal lives or dies on the gap between your yield-on-cost and the market cap rate, this is for you. The model runs the full feasibility and backs into the land bid so you stop guessing at the asking price.
Ground-up developers
You are pricing sites and need to know the spread and the land bid before you tie up the dirt.
Merchant builders
You build to sell. The profit margin on cost and the residual land value are the two numbers that decide the deal.
Value-add buyers going ground-up
You underwrite existing assets well; new construction is a different math. This makes the cost stack and the spread legible.
What is inside
A live feasibility model, the reasoning prompt that walks a deal end to end, and a worked ground-up example you can trace input by input.
Back into the land bid
See the residual land value the deal can support, so you bid the dirt off the math instead of guessing at the asking price.
Read the development spread
See your yield-on-cost against the market cap rate in basis points, so you know in one look whether the deal is worth building at all.
Sources, uses, and DSCR
See the full cost stack, the equity plug, and the permanent-loan DSCR walked end to end on a real-shaped deal.
Stress it on two variables
Read the 2-variable grid of exit cap against rent, so you see the band of outcomes instead of betting the deal on a single guess.
Calibrate cost and rent
Tune the build cost and rent assumptions to your real market and watch the spread and land bid recalc live, so the model speaks your numbers.
How to run it
Run the model in the tool you already use. The two no-code paths take about five minutes each. The dev-environment recipes are there if you live in a terminal, not because you need them.
ChatGPT
Custom GPT
No codeClaude
Project
No codeClaude Code
Skill
Dev envCodex
AGENTS.md
Dev envYour first prompt
Once the prompt is loaded and the model is open, paste a site and ask:
Run feasibility on this site: [paste land price, hard cost per unit, unit count, achievable rents, exit cap, market cap, and your target profit margin]
You get the development spread, the profit margin on cost, and the residual land value. The QUICK-START guide walks all five steps, including how to calibrate hard cost and rent so the model speaks your market.
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