I don't generally keep plans from past projects so I will have to guess on the dimensions. I know I don't make desk openings smaller than 24", so starting from that, and also that file drawer cabinets are about 17", I'll guess that the overall width is 58-60". The depth is probably 24", with the top extending to 25(+)". The ceiling looks like 9'. This was designed by a home-school mom with my input.

Thanks!