Adding a bathroom to it in the Complete gut remodel.

Remodeled new floors in the entire house.

I know that there are two online resources, local to Houston, that offer some good online estimating tools:Brant Phillips had one at point, but I don't see a link to it now... but I do know that Fast Track Remodeling has one on their site.  

Same can be applied for remodels / rehabs.

My husband owns a construction company and remodels rental properties for investors.

I totally remodelled kitchen, both baths, and finished the basement, adding significant living area.

I remodeled it to move in to, but ended up renting it out and here we are.

For a short term rental you’ll probably need 20% down payment (assuming you buy as an investment property), and then you’ll need around 15k for furniture + additional money for remodel.

Most units remodeled, and all in great shape.What’s the best way to unload?

I'd plan for $3-5K of repairs unless its completely remodeled.