Heck.. if you have the room... put in two duplexes and make your place a 6 -plex assuming it's zoned, you will find the numbers become more favorable the more units you can get on the lot as the builders will discount and fixed costs get spread around.A modular build is just a development process.

I checked with a few lenders and they had less favorable terms for jumbo loans (loan amount higher than 765k).

Way less people to deal with (9 versus 19)So Obviously I favor the brick and mortar homes.  

I  think a seller might look at that favorably.  2.

However, make sure you phrase it like you are doing her a favor. 

The prepayment is not favorable and the 30 yr lower payment until the seasonal period was over.

This way, you can make changes to the agreement to favor your interest in the transaction. 

The courts always favor the tenants too so if they were there under a year, it could be a real issue because it is so much harder to evict if they were paying the rent. 

That'll drive your next steps.If it merely relinquishing an interest, then prob nothing.If it is relinquishing interest in favor of a named party on the deed, then prob something.Ask your escrow person.

The first is more in our hands to be able to actively swing it in our favor, but the appreciation aspect isn't necessarily (outside of value add).