Rent is one question. The building's record is the other four: does it heat in winter, what is open against it right now, what happened when tenants complained, and was the work in the lobby permitted. All four are public, all four are free, and they sit in separate city systems that were never built to be read together. I build a property data tool, so treat me as interested, not neutral. But the method below uses only free city sources and works without my site, so I'm writing it that way.
A building's record is a state, not a document
Every apartment building in New York accumulates a paper trail across agencies. DOB holds construction, permits and structural matters. HPD holds the housing maintenance code, which is where heat, hot water, leaks and pests live. 311 holds complaints. OATH/ECB hears summonses from DOB, FDNY, DSNY and DOHMH. Each agency publishes its piece on its own website, with its own vocabulary and its own ID scheme, and none of them hands the record to the next.
That fragmentation is the whole reason almost nobody reads the record before signing. Not secrecy. Friction. The landlord knows the building's history. You can too, and it costs nothing but an evening. If you're a caseworker placing clients, the same check works for a placement as it does for your own lease, and it repeats for free at every address.
Question one: heat and hot water
HPD violations are classed by severity: A, B and C. Heat and hot water cases are Class C, the immediately hazardous class. That classification is the single most useful fact in this article, because it lets you separate signal from noise. A building with repeat Class C heat violations in January and February has a pattern. One from four years ago probably does not. Look at dates, not the total.
Here is what one heat complaint's paper trail looks like, because it shows you how the systems fit together.
A tenant calls 311 in January. 311 holds the complaint. If an inspector comes and confirms the condition, HPD writes the violation, and HPD holds that. If the heat still isn't restored, HPD's Emergency Repair Program can send its own contractor, do the work, and bill the owner. That charge doesn't arrive as a letter. It lands as a charge against the property, which is why Emergency Repair is its own numbered line on a municipal title search. Number 6 on the industry menu, if you're counting.
For a renter, the emergency repair trail is the sharpest signal in the record. It means the city fixed something because the owner didn't, even after a violation was on the books. One footnote: heat and hot water cases are pursued by HPD through Housing Court, not OATH, so don't be confused when they're absent from the OATH summons data. Different pipe.
Question two: open versus closed
A closed violation means the condition was corrected or the case was dismissed. An open one means neither has happened yet.
This distinction is why raw violation counts mislead people in both directions. A large pre-war building can carry hundreds of closed violations across decades and be perfectly well run today. A six-unit building with a dozen open violations right now is telling you something specific about right now. Total count on a big old building is close to meaningless. Open count on a small building is not.
So when you look at a violations list, sort it in your head twice: open before closed, then recent before old. The building's present tense is the small pile at the top.
Question three: 311 complaints and what became of them
A complaint is unverified. Somebody called. That is all a complaint is, and it's worth saying plainly because complaint counts get waved around as if they were findings.
What's useful is the disposition. An inspector came and wrote a violation. An inspector came and found no condition. Nobody came. Three complaints that all resulted in no violation tell you something different from three that each became one. The first pattern might be a feud or a chronically anxious neighbor. The second is a building where calls to 311 keep turning out to be right.
Question four: permits
Permits are the record of legal work. DOB publishes filings, issuances and sign-offs. Two things to look for.
First, is there work happening at the building right now, and does a permit exist for it? Renovation without a permit is a real signal about how the owner operates, and it's the kind that tends to repeat.
Second, stop work orders and vacate orders. Both are public, both are serious, and both belong in your decision before you sign anything.
Where each record lives
If you want to go direct to the sources, they are all free: HPD Online for housing violations, DOB NOW and BIS for permits and jobs, the 311 portal and NYC Open Data for complaints and their dispositions. The cost isn't money. It's that each is a different website, each calls a complaint something slightly different, and you have to reconcile them by address yourself.
That reconciliation is the product I built, so here is the disclosure and the boundary in the same breath. RegWatch puts those records on one page per building, attached to the parcel. Three of the eleven property tabs are open to anyone with no account, no card, no email: Overview, Violations & Permits, and Patterns. The data is as of last night's ingest, not live to the second.
The honest limits
Two things you should expect to find, because I'd rather say them than have you discover them.
New Jersey owner names are blank. Not missing, blank by law. Daniel's Law removed them from public records, and no product gets them back.
Coverage is deep for New York City and Connecticut, and thin for New Jersey and upstate New York. New York State gets 54 separate event feeds in my pipeline, most aimed at the five boroughs. New Jersey gets 5, and none of them is a violation feed. So if you check a Bergen County building and the violations tab is quiet, that is a coverage boundary, not a clean building, and you should know which one you're looking at. The same caution applies to any tool, mine included: a silent screen only means something where the data behind it is actually flowing.
One note on the rent question itself
Since it always comes up: most "average rent" numbers are asking rents, meaning what landlords list, not what your neighbors pay. Stabilized units in the same building can sit far below the listed figure. A benchmark is a sanity check on the ask, never a claim about the lease down the hall. My own rent tool works from an asking-rent index for exactly that reason, and when it has no reliable number for a ZIP it says nothing rather than inventing one.
The rent decides whether you can afford the apartment. The record decides whether you'll want to live there in February. Both questions have answers before you sign, and only one of them is on the listing.
Check the address free at regwatch.nyc. Three tabs, no account.