Apartment Check

An unofficial MCP connector that lets AI assistants check an NYC building's public record before you rent: housing violations, tenant complaints, 311 reports, DOB complaints and bed bug filings, from NYC Open Data.

Connect

MCP endpoint (Streamable HTTP, no auth):

https://apartment-check-mcp.dinerddev.workers.dev/mcp

Stateless: every request is independent. JSON responses; no SSE stream or session ID.

Tools

Tool	Inputs	What it does
`building_report`	`address` `bbl`	One-call overview of an NYC residential building's public record: open HPD housing-code violations by severity, rent-impairing violations, HPD / 311 / DOB complaints in the last 12 months with top categories, the latest bed bug filing and building basics. Use first when someone is considering renting at an address.
`housing_violations`	`address` `bbl` `status` open \| all, default open `severity` C \| B \| A \| any, default any `apartment` `limit` default 15	List HPD housing-maintenance-code violations at an NYC building, newest first, with severity class (C immediately hazardous, B hazardous, A non-hazardous), apartment, description and status. Filter by open/all, class, or a specific apartment.
`complaints`	`address` `bbl` `source` hpd \| 311 \| dob, default hpd `months` default 12 `apartment` `limit` default 15	Complaints filed about an NYC building over a recent period, with a category breakdown and the newest items. source 'hpd' = tenant housing complaints (heat, leaks, pests, mold…); '311' = all 311 reports tied to the address (noise, heat, sanitation…); 'dob' = Department of Buildings complaints (construction, safety, illegal conversions).
`find_building`	`address` (required)	Match a typed NYC address to buildings and return their Borough-Block-Lot (BBL), building number (BIN), borough and neighborhood. Use when an address is ambiguous, then pass the chosen bbl to the other tools.

All tools are read-only. Results include text for people and structuredContent JSON for agents.

Example prompts

I'm about to sign a lease at 1248 St Marks Ave, Brooklyn. Anything I should know about the building?
Does 350 E 21st St in Manhattan have open hazardous violations?
Any heat or hot water complaints at my building in the last two years?
What do people call 311 about at 123 Main St, Queens?
Show violations for apartment 4B at 1248 St Marks Ave.

Data & limits

Sources (NYC Open Data): HPD Housing Maintenance Code Violations, HPD Complaints and Problems, Bedbug Reporting, Buildings Subject to HPD Jurisdiction, DOB Complaints Received and 311 Service Requests.
Addresses are matched to buildings with NYC Planning Labs GeoSearch.
Records show reported issues, not current conditions, and update on each agency's schedule.
Results are cached at the edge for up to an hour (building basics and address matches up to a day).
Violation classes: C = immediately hazardous, B = hazardous, A = non-hazardous.

Example request

curl -s https://apartment-check-mcp.dinerddev.workers.dev/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"building_report","arguments":{"address":"1248 St Marks Ave, Brooklyn"}}}'

Support

Email support@dinerdapps.com.

Unofficial — not affiliated with or endorsed by the City of New York. Based on public NYC Open Data (HPD, DOB, 311), which reflects reported issues, not current conditions, and can lag. Visit the apartment and confirm with the landlord and HPD.