Look up permitted zoning uses and estimate mortgage payments and ROI for a client on the go with ChatGPT
Frank Trelles, then a commercial agent at State Street Realty in Miami, in CNN Business
He uses ChatGPT to look up permitted uses for land and zones in Miami-Dade County, and to calculate what mortgage payments or return on investment might be for a client. "I can ask ChatGPT what a mortgage payment would be on a $14 million purchase at a 7.2% interest rate amortized over 25 years with two origination points at closing, and in two seconds, it gives me that information. It also explains how it got the answer."
ChatGPT Free $0; Go $8/mo; Plus $20/mo; Pro $100/mo
Easy · or we do it from $149/mo
ChatGPT
The problem
Clients ask questions on the spot, like what their mortgage payments might be. He also needs to know the permitted uses for certain land and zones in Miami-Dade County.
What happened
He says it gives him the answer in two seconds and explains how it got it. Per CNN, the tool has struggled with some basic math, and Trelles said it's helpful for approximations on the go, not for exact numbers. No figures on time saved or deals are given. Self-reported.
Quoted in the source: Frank Trelles, commercial real estate agent, State Street Realty. Source: CNN Business: Real estate agents say they can't imagine working without ChatGPT now (Samantha Murphy Kelly) (2023-01-28) · Added 2026-10-20.
How to set it up yourself
- What Frank Trelles did: he asked ChatGPT for the permitted uses of land and zones in Miami-Dade County, and for rough mortgage payment and return on investment figures for clients, including from the car. He uses it for approximations, not exact numbers.
- Give ChatGPT the full loan terms: price, down payment, rate, term in years and points. Ask it to show the formula and each step.
- For zoning, ask for the permitted uses of a named zone, then confirm them in your county's official zoning code before telling a client.
- Treat every number as an estimate and say so to the client. Check it with a mortgage calculator or lender before quoting exact figures.
Copy-paste prompt
Estimate the monthly mortgage payment for a {PRICE} purchase with {DOWN PAYMENT} down, at {RATE}% interest, amortized over {YEARS} years, with {POINTS} origination points at closing. Show the formula and each step so I can check it. Then estimate a simple annual return on investment using rent of {RENT} and expenses of {EXPENSES}. Use only the numbers I give; never assume taxes, insurance or fees. If a number is needed but missing, write [MISSING]. Label every result as an estimate.One short email a day: 3 new AI use cases from real small businesses, each with its source and setup steps, plus a Tool of the Day. Free, no spam, unsubscribe anytime.
Tools used
ChatGPT
General AI assistant for writing, research, brainstorming and analysis.
From Free $0; Go $8/mo; Plus $20/mo; Pro $100/mo (checked 2026-10-17)
Visit site →Some tool links may be affiliate links. Disclosure
Checked prices: ChatGPT: from Free $0; Go $8/mo; Plus $20/mo; Pro $100/mo (verified 2026-10-17)
Rather not do it yourself?
We'll set this up in your tools, in your voice, tested. $149/mo with setup included (6-month minimum), or $497 pay-once. Satisfaction guarantee: we'll fix it until it works. Pay-once setups: or we refund your setup fee. $149/mo plan: cancel in the first 30 days and we refund your first month. Terms. We reply within 1 business day.
Get this set upRelated for Real estate
Draft a month of real estate social posts with ChatGPT and repurpose the winners
Each evening ChatGPT drafted 20 to 30 short Threads posts, which he scheduled; the best performers became Canva quote cards, then 30 to 6…
ChatGPT
Canva AI (Magic Studio)TThreadsWrite listing descriptions with ChatGPT and keep the agent's voice
The broker uses the free ChatGPT to draft property listings and other mundane writing, then edits for accuracy and SEO.
ChatGPTUse ChatGPT for listing copy, client follow-ups and market reports
ChatGPT drafts listing descriptions, personalised follow-ups using past conversations with each client, and neighbourhood market reports …
ChatGPTCanva AI (Magic Studio)Running something like this in your business? Submit your use case and we'll credit you with a link.
Get 3 new AI use cases every morning
One email every morning: 3 new AI use cases from real small businesses, each linked to its source, plus a Tool of the Day. Free. No spam, unsubscribe anytime. Privacy