Deck in the backyard

I am thinking about extending a tiny deck I have coming off the parlor floor of my brownstone. There is a 30′ setback rule (eg. the end of the building has to be 30′ from the rear property line) although there is an original extension which pre-dates the rule and is about 25′ from the property line and goes across about 2/3rds of the property. Are decks subject to the set-back rules? Can it be extend along (one or both of) the side property lines? Does it be made out of a fire rated material (ipe or metal?). And finally do I need a permit/landmarks approval to build it as long as it conforms to rules?

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