Reading REGULATIONS AND STATUTES, not some Realtor magazine.

I do recommend you talk to a local attorney and read your state statutes.

There are no statutes or rules on any level, anywhere, that require the junior to allow the relo, and nothing the senior investor says matters either.

I do like your reference to the statutes as I think it is best to use facts instead of speculation.

They likely wouldn't be able to certify the closing, transfer the title, or insure the property without it (assuming that clause is the result of a local statute, which is what it sounds like), so it sounds like the seller doesn't have a choice. 

The statute of limitations on notes in CA is 4 years.  

Lien waivers for any work accomplished back to the term of statute of limitations should be obtained.

re: 83.57 Florida statutes is the governing statute.

In other words, would the park prospectus and Fla statute 723 still apply?

@Mindy Jensen The Colorado Warranty of Habitability statute states, with regard to heating, as follows:  "A residential premises is deemed uninhabitable if it substantially lacks any of the following characteristics: . . .