Windows are in and the facade bricked up on all but the topmost portion of 535 Classon Avenue, about half a block from Fulton Street. The five-story building will have 38 units spread over 26,000 square feet. That works out to an average of 684 square feet per unit. The developer is Kahen Properties, and the applicant of record is engineer Shahriar Afshari of Roslyn, N.Y., according to permits. Click through to see more photos.