However, I have heard of one case where the lender required a "whole house" arsenic treatment system, which are about $2500-$3000 installed. 

If you purchased that property primarily for resale (fix n flip) then it does not qualify for 1031 treatment. 

@Jason RuelloAs said below, 5-10% of monthly rent should be allotted towards TRR (treatments, repairs, replacements).To get a more accurate number or capital expenditures, you can examine the age and state of major items of the house such as the roof, HVAC, water heater, etc.

Depends on how the foreign business is treated under US income tax law, and what treatment you elect under the check-the-box rules if the foreign entity is not a per se corporation for US income tax purposes.I strongly recommend you speak to your tax professional. 

For this reason, many self-employed, tax status traders do their trading through a wholly-owned corporate tax entity, either S or C (usually S), to open up retirement and health insurance planning opportunities.Second, you should talk to your tax professional about a Sec 475(f) election, and the interplay with the QBI deduction thereunder, taking into consideration Specified Service Business Treatment and phase-out limitations. 

The fact that REO properties are always AS-IS has nothing to do with the fact that many sellers of real estate are offering their property subject to inspections and negotiations on treatments, repairs, and replacement.   

Updated all lighting throughout, paint, exterior and interior, cleaned up landscaping, added new sod and landscape lighting stained all decks, window treatments, kitchen hardware, updated furniture and excellent photos.

Luckily, the exterminator found no evidence of them in any other unit and it was only $980 for the guaranteed treatment.

Needed paint throughout, every faucet and toilet replaced, new stainless appliances, total exterior face lift, new hotwater heater, new textured laminate flooring, crawlspace treatment, and over all attention to derrered maintenance.

Wastewater treatment?