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What did your Brooklyn row house look like originally? What year was it built? Who was the architect? Was it a two-family, one-family or something else? These are all questions original blueprints can answer. You may want to know because you are renovating, you have a passion for old houses, you are a new owner or you’re just curious.

Finding your original blueprints requires some legwork, ingenuity and persistence, as Brownstoner reader chemosphere recently discovered when researching his house in Flatbush.

He posted about the process, what he found and questions about the 100-year-old shorthand he was trying to decipher in a few separate posts in the forum. He has kindly allowed us to use those posts and the pictures of the blueprints he found to discuss in more detail how to find and read your original blueprints.