Question on Theoretical Ability to Build on Roof

We’re looking at a building and wondering how we can tell if we’re able to add living space on the roof. The listing has the following information: The zoning is R8B, Max FAR is 4 so available air rights are 2,230\. It is in neither a landmark or historic district. Is there additional info needed to determine the answer or is that sufficient? Finally, in terms of building on a roof, as I recall, if you duplex into a basement, the square footage of the rec room cannot exceed 80% (?) of the square footage of the apartment above. Is there a similar limit rule for in essence duplexing up onto the roof? Many thanks!

ejalbk

in Zoning 13 years and 7 months ago

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ejalbk | 13 years and 7 months ago

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OK. Thanks for the replies.

mike-the-expeditor | 13 years and 7 months ago

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As others have stated, it’s hard to give an exact answer without knowing the particular circumstances of the building in question.  Even if zoning allows for it, there are a ton of other considerations (engineering, fire surpression, egress, etc.) that may make it “fuctionally” prohibative.

pigthree | 13 years and 7 months ago

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There are height limitations and setback requirements.  what is the building class?

northofditmas | 13 years and 7 months ago

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See an expeditor, you cannot go by a general answer.  It all depends on a ton of site-specific circumstances – zoning, width of street, required setbacks, neighboring buildings, etc.  Do not assume you can use the existing footprint and go up.