Purchasers must apply for and be approved to reside within our Community

[Bill Schrimpf]

After listening to @john Federo podcast, I've been watching CL for mobile home price trends in my area.  I've noticed several ads for mobile's have a statement along the lines of "Purchasers must apply for and be approved to reside within our Community".  This seems like a Fair Housing violation.  Are there different rules for mobiles in a park?  I should clarify, these are often in "family" parks, and not 55+ parks.

Thanks in advance!