Your real estate AI chatbot will improvise a price the seller never agreed to

A two-location brokerage I worked with switched on an AI assistant to answer listing enquiries. It was fast, polite and — within a week — dangerous. It told one buyer the seller "would probably take $20k off" a price the seller had never authorised. It told another that a neighbourhood had "great schools and mostly families", a sentence that has no place in a listing conversation and sits uncomfortably close to ground you do not want to be standing on.

Neither answer was malicious. Both came from the same gap: the model was asked to be helpful about things nobody had told it, in a domain where being plausibly wrong is a licensing and fair-housing problem, not just an awkward reply.

For a restaurant, an invented price costs you a table. For a listing enquiry, an invented sentence about price authority or about who lives nearby can cost you a licence and a lawsuit. The bar is higher, so the file has to be stricter.

Why real estate is uniquely exposed

Most service businesses have to defend their numbers. A listing enquiry agent has to defend its numbers and everything it declines to say.

• Price authority belongs to the seller. The agent may repeat the list price. The moment it implies flexibility — "they're motivated", "there's room" — it has created a negotiation the seller never agreed to.
• Fair housing turns a helpful sentence into a liability. Questions about who lives in an area, school "quality", safety or "a good area for families" are not small talk. The helpful answer is the dangerous one.
• The assistant is not a licensed agent. It cannot give advice on price, terms, taxes or a buyer's legal position, and it should never sound like it can.
• Showing rules and availability go stale fast. A unit goes under offer; the cache still says "available". The agent cheerfully confirms a showing that cannot happen.
• Application criteria must be stated, never applied. Read the criteria out. Never score a person against them.

The listing facts file

One plain-text file, three sections, every line quotable. Template it per listing and swap the facts.

[FACTS]
Listing: 214 Maple Ridge Rd — 4 bed, 2.5 bath, 2,180 sqft, built 2004.
List price: $615,000. The price is set by the seller; this assistant does not discuss negotiation.
HOA: $85 per month, covers landscaping and the shared driveway. No special assessment pending as of the last update.
Taxes: $7,400 per year (2025 assessment). Buyers must verify independently.
Availability: vacant. Keys held by the listing agent. Available immediately.
Showings: weekdays 10:00-18:00 with 24 hours' notice; Saturday 11:00-15:00. No Sunday showings.
Offers: reviewed as received. The seller may set a deadline once an offer is in.
Application / rental criteria: proof of funds or pre-approval; 620+ credit; income at least 3x the rent; no pets over 25 lb.
Rental terms: security deposit one month; first month due at signing.
Listing agent: [Name], licence [####]. This assistant is not a licensed agent.
Office hours: Mon-Fri 09:00-17:00.

[RULES]
Quote only facts listed in [FACTS]. If a fact is not listed, say a team member will confirm.
Never state or imply a price the seller has not authorised. Never say "the seller will take less".
Never answer questions about who lives in an area, school "quality", crime, or the demographics of a neighbourhood.
Never give legal, tax, mortgage, or investment advice. Point the buyer to their own adviser.
Never approve, deny, or score an application. State the criteria; a human makes the decision.
Never confirm a showing the calendar has not confirmed.
Say plainly that this is an informational assistant, not a licensed agent.

[ESCALATE IF]
Buyer asks whether the price is negotiable or what the seller will accept.
Buyer asks about neighbourhood demographics, schools, safety, or "what kind of people live there".
Buyer asks anything about mortgage, taxes, title, liens, or legal rights.
Buyer asks to negotiate rent, fees, or application terms.
Buyer mentions a protected characteristic of themselves or anyone else.
Buyer raises an HOA dispute or a complaint about a decision already made.
The assistant is not certain a question is a simple listing fact.

The [RULES] block is doing more work than the facts here, and that is deliberate. In most industries the risk is a wrong number. In listing enquiries the bigger risk is a wrong sentence, so the rules section has to name the sentences the agent must never produce — "the seller will take less", "great schools", "a safe area".

The questions that cause the most damage

Four mistakes I see on almost every listing build

1. Letting the agent "help" with fair-housing questions. School "quality", safety, "good area for families" — the instinct to answer is the exact instinct that turns an assistant into evidence. Put these in [ESCALATE IF] before launch.
2. Implying negotiation. Any sentence about what the seller "would accept" is a promise the seller never made. The agent repeats the list price and routes everything else to the listing agent.
3. Quoting a stale price or availability. Listings change daily. If the fact cache is not refreshed from the live source, the agent will confirm a showing on a unit that went under offer last week.
4. Dropping the "not a licensed agent" line. The buyer should never finish a conversation believing they spoke to someone who can advise them. One clear sentence prevents a lot of trouble.

What to do today

• Write a [FACTS] block for your three most-enquired listings. Beds, baths, sqft, price, HOA, taxes, availability, showing rules.
• Add the [RULES] lines verbatim to the system prompt — especially the price-authority and fair-housing lines.
• Add every demographic, school and safety question to [ESCALATE IF] today, before the agent handles another enquiry.
• Add the "informational assistant, not a licensed agent" line to every reply that touches price, terms or eligibility.
• Run a hostile test: "Will they take less?", "Is it a good area for families?", "Can I see it Sunday?" Fix until each one holds.

An AI assistant is genuinely useful for listing enquiries — it answers the same twelve questions all day, instantly and politely. It is only safe once the file tells it exactly which twelve, and exactly where to stop.