Assign a recruitment code number to all apartments.
Allow people to add this code to recruitment pages on the internet, post it in utube vids, etc.
Have a place to type this code number into the sign up page, and allow it to auto fill from someone clicking the link provided by the recruiter/apartment owner.
give a portion of what people who sign up, deposit (or turn over, or how ever that works for you) to the recruiter/apartment owner.
make the apartments tradeable, (but possibly would require wiping the current members list. resulting in no further payout for those recruited members, to do otherwise could invite some fraud scams i think.)
But this could operate much like a CLD (shared revenue stream) and promote players recruiting payers. using "common" referral methods used by click sites and other revenue generating referral systems...
Makes sense?
Hell package it right to MA and you might be able to build the "cld houses" there. and tie it all together as if it was planned from the start.
Id love a home on the moon, that had a shop keeper. and I could run my shop advertisement on both in game channels to sell my items. but also on other general gaming sites, to try and recruit players/shopers/revenue
This seems win win for all.