Does a basement apartment in a two-family need a back exit?

We are looking at a two-family frame house in the Slope. The house is three stories plus english basement, zoned as a two-family. The basement studio apartment has one door plus two windows with outside bars, all in the front of the house. How can we figure out if this violates the building code? Where can we find out what the requirements are for number of points of egress / light and air / etc? There seem to be a lot of regulations and we’re having trouble figuring out which ones would apply in this case.

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