With an increase of about 7% over last year in Denver (https://www.cpr.org/news/newsbeat/colorado-springs...) and no contraction in sight, scheduled rent increases should continue to multiply that $2,600 of mailbox money forever more, or at least until your portfolio review. 

I agree with @David Krulac - hopefully your property is in one of the 2% RTT areas rather than one of the 4% or 5% RTT areas.The imputed property value used to determine the RTT amount can be found by taking the tax assessed value from the tax assessor, and multiplying (or dividing) by the common leveling ratio that the PA Department of Revenue has posted at their website, for the year and month of the transfer (the values in their table change over time).Once you have that value, and the tax rate for that location, you can figure out how much this screw up cost you ;)

This doesn't appear to be your case though.Appraisers use a gross rent multiplier to determine the income approach in small multifamily properties.

Just take the rent and multiply by 50% and use that as a rough total for expenses in addition to any debt service.The numbers you have above yield total expenses of $33,575 (59% of rents so the rule of thumb isn't needed).  

Well then you take the $900 and multiply it by 12 to give you a year's total income and then subtract your yearly fees from that which is generally about 35%  (10%-Management, 5%-Maintenance, 5%-Vacancy, 15%- Insurance & Taxes.).

From there, you could take a line of credit or be refinancing to pull cash out and then really come up with a plan for that cash to multiply it through flipping, buying, rehabbing and raising rents, etc. 

Im $140,000 in debtNOI:  $6,944.00Cash on Cash ROI:17.56%Monthly Cashflow:$439.09Income-Expense Ratio (2% Rule):1.96%Total Initial Equity:$94,000.00Gross Rent Multiplier:1.89Debt Coverage Ratio:4.15Purchase Cap Rate:27.78%Pro Forma Cap Rate:5.79%

Your name, license number,brokerage (if any) and license status is publicly available.The NAR,State Board,and local boards have agreements with suppliers to give your contact information away to them so they can advertise their services to you.Be prepared for an avalanche of emails and snail mail in the next few weeks.

You'll need to determine your current DTI with the following formula: monthly income divided by 12, and multiply that by .45 (you'll really get a lenders attention by knowing this ahead of time, and come off much more professional). 

Is 0.75 multiply against what is charged for rent for the month or is multiply to the cash flow I get after I subtract all expenses such as insurance, taxes, and paying the existing home mortgage?