Deck in Co-Op building

Hi,
I live in a Co-op building in Park Slope. We have the duplex including the top floor. We also have the roof rights above our space.
To build deck I need board approval. So far so bad.
Can a board turn down my request to build a deck?
Does anyone know what are the legal requirements to build a deck? How close can I get to the edge of the roof? Do I need an architect? Is a contractor able to deal with all the legal requirements? Are there any helpful website?
Thanks inadvance
A

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