@Dana Carr I don't think that spending much money on this will add to value of the property or increase rents.

They give tourists an alternative option to boring hotels, while spending money at restaurants and other area attractions.

. $67k cash - had to spend about $2k to get tenants evicted and the house is trashed.

Houston Real Estate Highlights in NovemberSingle-family home sales rebounded from a slight decline in October, rising 3.9 percent with 8,320 units sold versus 8,010 in October 2020;Days on Market (DOM) for single-family homes dropped from 46 to 35;Total property sales rose 5.6 percent with 10,216 units sold;Total dollar volume increased 20.6 percent to $3.7 billion;The single-family average price rose 12.6 percent to $383,807; The single-family median price increased 16.3 percent to $314,000 – an all-time high first reached in June of 2021; Single-family home months of inventory registered a 1.6-months supply, down from 2.1 months year-over-year and below the national inventory of 2.4 months;On a year-to-date basis, single-family homes sales are 12.0 percent ahead of 2020’s record pace and 22.2 percent ahead of 2019.Townhome/condominium sales rose 16.8 percent with the average price up 16.0 percent to $258,970 and the median price up 10.5 percent to $210,000;Single-family home rentals rose 7.1 percent with the average rent up 8.5 percent to $2,042; Townhome/condominium leases increased 5.1 percent with the average rent up 3.8 percent to $1,737.Source HAR 

Spending extra for an extended warranty and advertise them when selling the property (would it actually increase the price of the property?)

At least, it is if spending 50k for a fourplex is too much for you. 

I have not done so yet, as I'm already spending so much money. 

It's a fine line....you gotta take care of yourself, but spending foolishly is easy to do!

They will continue big spending, witch will further inflate the economy.

@Kate LeeIf that was their opening stance, they likely don’t want to spend any time until they have a signed agreement.