No, the place is not residential.
No, the place does not serve food and/or beverages.
I've thought on it and IMO yes, it is a professional office space.
No, none of the Crane men work there.
No, it is not Bebe's office.
No, it is not connected to KACL in any way.
Yes, the place is in some way medical.
No, it is not the fancy spa where Niles and Frasier got obsessed with reaching the highest level.
No, it is not the sperm bank that Niles revisited.
No, this place does not appear in Seasons 1-6.