Welcome board.  

For the condo building is there something equivalent to a yard sign for a SFR (maybe a bulletin board downstairs?). 

I know one can find property tax protest records publicized by the Board of Equalization / local municipality in many states, but I'm not sure if this is true for all 50. 

I agree, you need an attorney and a tax professional on board with you.

.- Additional subfloor (wood) and cement board (floor) $100- Shower cement board $75- Waterproofing Membrane (I like to do this) $150- Shower wall tile (80-90 SF) $150- Flooring tile (30-40 SF) $100- Tile setting and grout $75- Vanity with top and mirror (24" it looks) $250- Toilet, wax ring and feed line $100- Faucet, feed lines and trap $75- Trim $25- Accessories $40- Fan/light $150- Vanity Light $50- *Shower diverter valve with trim kit and plumber to install and help set tub/drain. $750- Screws, adhesives and fasteners (cement board screws, caulk, etc) $50- Paint $40- Miscellaneous $100TOTAL: $2530With all of that said these numbers would be my BASE run, and assuming I was spending my budget amount on each item.

Between the license fee, the board fee (if it is required) and the monthly fees that you are charged and of couese update courses every year and other continuing education classes that may have a fee. 

Also learn how to find owners of properties (start at your county tax/assessor's office) that appear vacant or need work (look for tarps on roofs, overgrown grass/weeds, boarded up windows, etc.).Good luck!

Tankless also has MUCH more to go wrong with it,  circuit boards, ignitors etc.   

@Ryan Ksiezopolski,Here's some ideas to get the seller more on board with your line of thinking.. 

Then it goes to the state workers compensation board to determine if they were employees under the state workers comp. laws.