SInce Fannie Mae changed the rules about funding loans on properties classified as Live/Work, the choices for financing lofts have been reduced. We do have a source for financing Live/Work.
One tip: to check whether the property you like requires special financing, look at the Preliminary Title Report. If there is a recorded "deed restriction", you must get a copy to see exactly what it says.
If there is no deed restriction that specifies an owner must have a business license or conduct work or art-related activity to own the unit, you may be able to use conforming (regular Fannie Mae) financing, which will usually carry the best rates and more choices for loan types.