The real estate business is all about location, location, location, and it's the same way for both layer 2 and layer 3 devices.
What does the "real estate business" means ? I found it in a Cisco document.
See: real estate - definition of real estate by the Free Online Dictionary, Thesaurus and Encyclopedia.:
"Land, including all the natural resources and permanent buildings on it."
Hope this helps
PS It's basically AME. In UK terms, it's what an Estate Agent would handle.