How to find the history of your house in New York City
A step-by-step guide to every free source — ACRIS deeds, PLUTO, the 1940s and 1980s tax photos, the census, old newspapers, the NYPL map division, and landmark status — for tracing who built your house and who lived in it.
By The Plot Team · May 28, 2026 · 5 min read
New York City is the best place in America to research the history of a house. Almost everything you need is online, free, and surprisingly deep — the city has been recording property and photographing buildings for over a century, and most of it is now public. Here is the whole toolkit, in the order a researcher actually uses it.
Start with the lot: PLUTO and the building class
Before you chase a single deed, anchor yourself to the parcel. Every taxable lot in New York has a BBL — Borough, Block, and Lot — and the city's PLUTO dataset (Primary Land Use Tax Lot Output) hangs an enormous amount off it: the year the building was built, the land use, the number of units, the building class, and the lot's dimensions.
Look up your address in the Department of City Planning's ZoLa or GeoSearch to get the BBL, then pull the PLUTO row. The year-built field is your first real fact. Treat it as a strong hint, not gospel — for older buildings the city often recorded a rounded or estimated year — but it tells you which census and which maps to reach for next.
Trace ownership: ACRIS, the deed chain
This is the heart of it. The Automated City Register Information System (ACRIS) holds the recorded property documents for Manhattan, the Bronx, Brooklyn, and Queens going back to 1966 online, with scanned images of older instruments reaching back much further. (Staten Island's older records sit with the Richmond County Clerk.)
Search ACRIS by borough, block, and lot and you get the deed chain: every recorded transfer, mortgage, and satisfaction, with grantor (seller), grantee (buyer), date, and document image. Read it oldest-first. The chain tells you who built the house, who they sold to, how often it changed hands, and — through the mortgage record — roughly what it was worth at each step. A long gap with no transfer usually means one family simply held the house for decades, which is its own kind of story.
Put a face on it: the tax photos
New York photographed every building in the city twice for tax purposes — once around 1939–1941 and again in the mid-1980s. Both collections are digitized and free through the NYC Municipal Archives. Pull both and you have a then-and-now: your house in black-and-white during the Depression and again four decades later. The 1940s photos in particular are a gift — you often see the original stoop, the storefront, the awning, sometimes the people who lived there standing in the doorway.
Find the people: the census
The U.S. Census is enumerated every ten years and released to the public after 72 years. That means 1850 through 1950 are all open today (the 1950 census was released in 2022). Search by address or by family name on the National Archives site, FamilySearch, or the 1950 census site. You'll find names, ages, occupations, places of birth, and who shared the house — boarders, in-laws, three generations under one roof. New York's mix of immigrant origins makes these records especially rich.
Read the papers: Chronicling America
The Library of Congress's Chronicling America puts millions of digitized newspaper pages online for free, covering roughly 1836–1963. Search your street name in quotes, scoped to New York, and you'll surface real-estate transaction columns, auction notices, society pages, and the occasional fire or court report naming your address. This is where a deed becomes a story — the same sale that appears as a dry line in ACRIS often shows up in the paper with the broker's name and the price.
See the block over time: maps
The New York Public Library's Map Division and its Map Warper tool host an extraordinary run of historical maps you can browse and overlay on the modern city. For building-level detail, the Sanborn fire-insurance maps (most accessible through the Library of Congress) show your block footprint by footprint, color-coded by construction material, often decade by decade. Together they let you watch a farm become a street become a row of houses.
Check its legal status: landmarks and the National Register
If your house might be protected, two sources matter: the NYC Landmarks Preservation Commission (individual landmarks and historic districts, with detailed designation reports that are themselves mini-histories) and the National Register of Historic Places. A designation report is a goldmine — preservation researchers have often already done the deed and architectural work for you.
Where it gets hard
The honest part: the older you go, the more the trail moves offline. Pre-1850 records, partition suits, and many wills live only in bound volumes at the city's borough clerk offices or the Municipal Archives reading room. Newspaper OCR misreads names and addresses constantly, so verify every clipping against the deed. And census enumerators spelled phonetically — your "Kalkhof" may be indexed as "Kalkoff."
Let Plot do the digging
Every step above is real, and you can do it yourself — but it takes a weekend per house and a tolerance for clunky government search portals. Plot does all of this automatically. Type an address and Plot pulls the PLUTO lot facts, walks the ACRIS deed chain, scans Chronicling America for press mentions, gathers archival imagery, and assembles it into one written history with every fact cited to its source. It's the weekend of research, in a minute.