There is a place in soho on spring streetby ya_ya
That has been there for years, they have weekly open life-drawing classes. ask there. they are on the south side of the street, near the 6 train. the entrance is a stairway to the basement, painted white w/ art notices on the walls going down. i think it's just west of the vegetairian restaurant on the corner of spring and lafayette, but i could be a little off about that.