Pulte alleged that Cook also classified that property as a primary residence, even though she rented it out.

Did Trump rent out one of his primary residences? If yes, then he did the same thing. If no, he didn't.

Tangentially related, why do rich people take mortgages? If I was rich, I'd pay cash, but maybe that's the wrong way.

If I buy this place as a primary residence, can I airBnB it when I'm not in town?

(answering my own questions)
I wonder if Lisa did the "Second Home Rider" with the mortgage? She should have had a lawyer do the buy! (I sure will)

Fannie Mae and Freddie Mac Loans

A second home loan might include a Fannie Mae/Freddie Mac "Second Home Rider" with the mortgage. This rider often includes the following terms with which the borrower must comply.

The borrower will occupy and use the property as the borrower's second home.
The borrower will maintain exclusive control over the occupancy of the property.
The property can't be subject to any timesharing arrangement or rental pool.
The property can't be subject to any agreements that require the borrower to rent the property or give a management firm (or any other person) control over the occupancy and use of the property.

So, this rider makes it seem like you can't rent out a second home. However, Fannie Mae and Freddie Mac rewrote their guidelines to clarify that if you have a Fannie Mae or Freddie Mac mortgage on a second home, that house can be used as a rental property, subject to some limitations. The rider says the borrower will keep the property available primarily as a residence for the borrower's personal use and enjoyment for at least one year unless the lender otherwise agrees in writing (the lender can't unreasonably withhold consent) or unless extenuating circumstances exist that are beyond the borrower's control. Here are the rules:

During the first 12 months, short-term renting is allowed. But you must keep the property available primarily as a residence for your own personal use and enjoyment.
After you've owned the property for a year, you can do longer rentals.