Where to find age-restricted 55+ rentals for 'seniors'?

[Phil Pavarini]

I've owned and been managing rental apartments for nearly two decades. Never was into renting age-restricted units. This year we're building several standalone rental cabins and have been trying to advertise to the 55+ crowd. (There is more 'backstory'... we intend to begin offering additional services like daily meals, housekeeping, etc, in the future, but for now, it's non-nursing, non-medical, simply standalone rentals.) The Housing for Older Persons Act of 1995 (HOPA) seems to specifically permit this sort of rental. However, ALL of the major for-rent aggregators that syndicate with Realtor.com say it's prohibited and they will not allow it, under Fair Housing Rules. Seems counter-intuitive and discriminatory to me. Yes, I've heard to see where other 55+ rentals are advertised, however, it seems most places mostly work with more advanced care, like nursing, assisted living, etc.  Does anyone have suggestions on where to advertise non-medical, non-nursing, non-assisted living, simply age-restricted 55+ rentals?