This is a condominim so the homeowner's association has the "right of first refusal".
SInce this is an 55+ community in a very friendly and quiet atmosphere, the owners intend to keep it that way and have their rules which a buyer must abide.
They also check for credit score, criminal background, etc.
If you qualify, the steps are not overly difficult, you just have to be within their parameters.
Start by reading the Instructions and application package.