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Brownstones and limestones on Jefferson Avenue in Bed Stuy. Photo by Cate Corcoran

How can you know the age of your house or apartment building? Here’s the one rule you should be sure to follow in New York City.

Don’t. Trust. The city’s. Tax records.

Most people — from real estate agents to curious residents — will believe that a building’s tax records state the year it was built. But 99 times out of 100, that number is just plain wrong.

Your Carroll Gardens brownstone with marble mantels was not built in 1936. Sorry.

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Inside a Clinton Hill mansion, circa 1876. Photo by Swann Galleries

The city’s number is just an estimate. Sometimes it dates from a 20th-century alteration or other change. Your best bet is to just ignore it.

Fortunately, there are any number of more reliable ways to gauge the age of your home. We suggest you start with these:

  • Architectural style. Do you suspect just by looking that the house is older than the 1920s? Fireplaces are a clue, as are high ceilings, old staircases, stoops and — in row-house areas — an extra-wide lot.
  • Old newspapers. If you’re in Brooklyn, check the online archive of the Brooklyn Daily Eagle to see if your address appears earlier than the year given by the city. Type in the full address in quotation marks.
  • Old maps. Search for old fire insurance maps in the New York Public Library’s image database to see when your building appears.
  • Directories. See if an old city directory lists your address and its human inhabitants. The Brooklyn Public Library has a few you can search online.

Whatever you do, don’t stop with the city tax records.

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Stained glass on Hancock Street. Photo by Cate Corcoran

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Walkabout: Researching Historic Buildings, Part 3
Researching Your Old House: How to Find Original Brooklyn Row House Blueprints
Watch This 19th-Century Bed Stuy Mansion Get Demolished Day by Day

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  1. I feel like the easiest way is to go get your blueprints from the DOB. You get a folder, it has the original blueprints and a whole host of other information (like the paperwork submitted to get the building project approved) and they’re all signed and dated. You’ll find out who had the house built, which architect did it, and what date it was completed. You’ll also see plans and paper work for all the additional construction projects that happened over the years like an addition or a garage, etc.

    Everything you listed above just leads to more guess-work.

    • Amzi, I would love to find out, and who was the architect. I was told the usual 1898 but who knows?
      It looks like my house is part of a few in the same design that are different from the rest of the block

      I’m on Hancock street