Currently my husband's parents own the property but need to sell due to declining health. 

There is strong data that correlates lead exposure with health problems. 

The host has to decide what their unfair advantage in the market is going to be (location, pool, hot tub, amazing view, high-speed network, great for families, close to everything, themed house, etc) and market to that.Mike

That's because you probably don't have resources on the ground to get a hot tub fixed stat, or fix a sticky door lock.

Zoning make sure its zoned  then health department for waste disposal.

He then drew up a site plan, the county health department perc'ed it themselves, and now we're just kind of waiting for me to get the financing the finish the job here.

Al 2 bed 2 bath units with updated open kitchens and modern baths, some with deep tubs!

She is actually okay for the past few years until she saw that I have totally rehabbed one unit when tenant moved out and I guess she feel jealous and have since demanded a lot of repair/upgrade and started making a lot of accuse saying mold issue causing health issues but at the mean time trash my yard and keep the common area dirty.

All - I am looking for a hot tub for my STR.

I don't think a sauna and hot tub are necessary for a MTR.