I came to ask this question. I don't understand why EA adds such limitations. I spent hours building an amazing family home with Vet clinic on lower level, only to discover that there's no way for my sims to both live and make money there without annoyingly having to use the portal every day. And even with the portal, I see no way to get my own personal pets to the lot without making a sim go to the empty home lot and then travel back to the clinic with the pet. :'(
Thus far, have not found a mod for this either. Was hoping there would be some custom trait mod out there by now.
Because there are so few lots in TS4 anyway, I really don't want to take up 2 lots just for one to be an empty shell and another for the clinic/home.
