Consider adding gutters and extensions versus french drain.

Scottish, French, German, Polish).

I had a lot of rain water drainage issues in the past for which I built a french drain /trench drain on the side and back which stopped those drainage water issues flooding my backyard and crawlspace areas(at one point lot of drainage street rain water used to sit many days in crawlspace which used to be pumped out by handyman).

(Which is why "mesne" often has the French pronunciation "main.") 

Specifically I could add a French door to a room to make it a bedroom.

If they can't do that, keep shopping.This may require digging up the foundation, sealing it from the outside, and installing a french drain to keep water away from the walls.

Quote from @Anthony French: I’m relatively new to real estate development, having completed only one fix-and-flip project.

Add thoughtful touches like a Keurig or French press, USB chargers, and local travel guides.

Additionally I will have multiple skylights, lot's of window area and one maybe two French/sliding doors.

There was a glut in wineries not long back when The Australian dollar was high and people who once couldn't get enough of Australian wine suddenly turned back to relatively cheaper and more fancy sounding French and Italian plonk, combined with the change in regulation in the Chinese wine market that killed it as a business drink.