This is a studio with terrace. There is no sq. footage given, but the livingroom according to the floorplan says 13 x 13.10. This does not include tha bathroom, the pullman kitchen and the two closets. In addition there is a terrace measuring (again, according to the floor plan 13 x 5
Usually with a coop there is no exact square footage given, sometimes it says approximately. In a coop you don't buy square footage but shares.
I hope this gives you a bit of an idea.