@Manuel AngelesThe Post likes to lay it on thick.

A new acrylic tub should last 15-25 years if you buy a thick enough one.

And Topeka is in the thick of it. 

The floors are typically old white or red oak 2 1/4 nail-down tongue-and-groove strip, 3/4 in. thick.

I use a thick piece of posterboard.  24 horizontal lines, each represents an address. 

Assuming it is a normal sized sidewalk section (4” thick).

Anyways his stuff was around $45/sq ft - pretty affordable - it's a bit thinner since they use plywood underneath the granite and it's somewhat of a veneer with a thick edge -- it'd make sense if you saw an install.  

I agree with @Tom Ott most of those houses are in pretty rough areas you will likely struggle to do well in unless you are local, have thick skin, and are very active/hands-on (i.e. feet on the ground, keeping tight control of the property operations).

You will need to have thick skin when it comes to the small things.

Rehab budget went about 20k over; we were unaware of the issue of the walls thickness at purchase and the roof rebuild ended up taking an additional month to complete.