Small Office building

I set myself the challenge of building a small office building on and off over the last year. I am not an architect but did want the challenge. This building has 681 constructions and 34 objects. I have used two panels for ceilings and floors (except roof) so that both can be colored/textured the way you wish. There are 5 floors plus the roof and also an elevator shaft of sorts . All windows have glass and there are double glass doors on the ground floor on one side but if you want doors on every side you can remove the windows where you want the doors to be. The building is plaster and metal and I have kept it pale grey etc so you can paint it up the way you would like. There will be mistakes here and there (DId i mention im not an architect). I have left it as a shell so you can arrange the floors as you would like by adding walls etc etc. I am very keen to see what people do with it and any suggestions on improvements would be much appreciated and I used the smallest grid scale to build with so keep that in mind when making additions.