How big does a bedroom really have to be?

I’m doing a 2-studio combo in a coop. The end goal is a 3-bedroom, 2 bath apartment. Master bedroom will be 11 x 17. Bedroom 2 will be 10×8 The third ‘bedroom’ is the issue. The room will be 8×8, maybe 8×9 if we reduce the hallway a bit more. My architect refuses to make this third room. She says it won’t be a legal bedroom. Her solution is to build out walls in front of the windows by about 10 inches or simply not build the room at all and give us a L-shaped living room. Personally, we plan to use this room as a home office, but she says that an office with a window is still a habitable space and therefore must be 80 sq feet. She says the DOB will flag this and cost us thousands of dollars and at least a month of approval times. Has anyone gotten a 3rd bedroom of 8×8 through the DOB? Has anyone gotten a windowed office through the DOB? She’s using the 1968 code. I’ve bolded the section that I think should apply: §[C26-1205.7] 27-751 Minimum dimensions of habitable rooms, is that habitable rooms shall have a minimum clear width of eight feet in any part; a minimum clear area of eighty square feet and a minimum clear ceiling height of eight feet for the minimum area, except: (a) A room which complies with the requirements for natural light and ventilation and in addition has an opening of not less than sixty square feet into an immediately adjoining room may have a minimum floor area of seventy square feet and a least horizontal dimension of seven feet; (b) A dining space which has legally required ventilation, and in which the window has an area of at least one-eighth the floor area of such dining space; **(c) One-half the number of bedrooms in a dwelling unit containing three or more bedrooms may have at* least minimum dimension of seven feet;**