While speaking to an LNI inspector, I was shocked he made a comment that it was "suspicious" that we hired mostly African-American employees and subcontractors.

A few questions I have are as follows:- Will financing for investment SFH or Multi Family units be that much more difficult as a contractor making 130-170k/annually as opposed to a W2 employee?  

It will be managed by property manager with 10% fee on the monthly gross income.

Once it's stabilized, gross monthly rents will be $2600.

I know the formula is Net Operating Income/Gross Rental income.

Rules of thumb are OK for eliminating multiple prospects, but at some point you have to look at trailing financials and use them to make your future assumptions.After you have looked at a few deals you will begin to get an average of certain costs, not their $ amount but their ratio of gross operating income.

Annually I collect $25k-$30k gross for rental income total for both properties (sometimes rent a room out in my other house).

It generates an income of $500 per unit per month, total gross of 2000 per month.

For example:On one 48 unit apartment I have the monthly gross income is $35,000.

This is considered earned income (just as if you were an employee or a business owner buying and reselling any other product) and you will be taxed at your marginal tax rate.