Had I done so I would have save a great deal of anxiety, money, and time because I would have known that he had several federal tax liens and was sued by creditors for skipping out on bills, hires undocumented workers, and sexually harasses female tenants. 

Alternatively, the taxpayer may change from the impermissible method of determining depreciation to the permissible method of determining depreciation for a 1-year depreciable property by filing an amended federal income tax return, or an administrative adjustment request under § 6227 (AAR), as applicable, for the property’s placed-in-service year prior to the date the taxpayer files its federal income tax return for the taxable year succeeding the placed-in-service year.

Not sure if this is depending on each lender since it is related to Federal.

Yeah Yeah Yeah... since TCJA these federal deductions disappeared, but some states still allow for them to be deducted.

If you don't have enough random deductions to warrant itemization and you simply take the federal standard deduction, then your primary interest doesn't do you any good. 

Additionally, it can help maximize renovations and improvements.A Cost Segregation study is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

The JOBS act allowed people to advertise (it was a federal crime before).  

I used to work on the naval base right out of college for Navy Federal.

For your primary residence, lenders have to abide by federally required ability to repay (ATR) rules.

Not sure if this is depending on each lender since it is related to Federal.