Below is what I normally figure for a service size on commercial buildings when square footage is the only thing given to me.
Basic Electrical Mechanical (1,500 to 2,000 Watts/Ton)
BldgType Watts/SF SF/Ton
Data Center 50, As Needed
Detention Facility 6, 300
Educational 6, 350
Hospital 20, 200
Hotel 6, 350
Medical Building 7, 300
Office Building 7, 300
Public Building 6, 300
High Rise Residential 4, 400
Retail 4, 300
Warehouse 2, 500
Note: No Electric heat. If electric heat then add approximately 30btu/sf.
I hope you can read this it looks good and in columns when I type it on the previous page but when I post the reponse it removes all of the spaces between the columns.
Hope this helps.
-Ed