Median gross rent of $530, median household income of $25,000.

Not sure if this is most appropriate forum, but here we go:In my analysis, I deduct 25% from gross rent to account for repair and maintenance, Capex, and vacancy, and to build up reserves. 

If it is just the business and not buying a building or the land beneath it then it is not generally a real estate licensed activity.You need to check for each state what is or is not required.You could go on a site like Rocket Lawyer etc. and for a nominal fee ask the question.In commercial real estate transactions you can generally have consulting and other fees on the HUD-1 as RESPA does not typically apply.To look for more businesses you could look at bizbuysell.com  Sellers typically want 3 times gross profit earnings so if 100k a year after expenses they want 300,000.

Since I'm viewing this property as a long-term hold, I built in a pretty hefty maintenance and reserve budget of $8k (about 7% gross rents) assuming in 10 years i will need to replace/maintain these high efficiency systems. 

You need a new property manager.The "50% rule" is a rule of thumb that say of the gross scheduled rents, expenses, vacancy and capital expenditures will eat up about 50%. 

I'm using Harrisburg PROPERTY MANAGEMENT Group for two of my properties they charge me 8% of gross rent.

That would be 8% of gross rent.)  

I Rehabbed the both units for about $25k and its now all rented out totaling $3,400 gross. 

Since you are excluding fees (which would leave you with a gross profit), are you counting insurance?

One-time Expenses$1000 - Acquisition Costs (minor rehab, legal, & inspection)Annualized Expenses10% Gross Annual Rent - Vacancy Costs (turnover & lost rent)10% Gross Annual Rent - Property Mgmt (standard)$1176 - Repairs & CapEx ($1 per sq foot for tpical property)$1516.46 - Property Taxes (5 year historical average for typical property + 10%)$1000 - Property Insurance (a nice round number: seller reported that he paid $708/mo for one duplex)$27 - Water & Sewer (average across several properties from last month)$0 - Gas, Electric, HOA, Snow Removal (tenant pays or not applicable)$60 - Lawn Care (I made this number up)COMPARATIVE ANALYSIS:This is my analysis of the five properties that are being negotiated right now, listed from best to worst.Property Alpha (two-flat)$1250 - Income, Monthly (actual)$567.37 - Expenses, Monthly (estimated)$42,000 - Price, Signed Contract36% - Cap Rate (Annualized Income / Price)16.6% - ROI, After Tax (annually, assuming 15% income tax)6.0 Yrs - Until this property pays itself offProperty Bravo (two-flat)$1100 - Income, Monthly (actual)$537.37 - Expenses, Monthly (estimated)$42,500 - Price, Signed Contract31% - Cap Rate (Annualized Income / Price)13.1% - ROI, After Tax (annually, assuming 15% income tax)7.6 Yrs - Until this property pays itself offProperty Charlie (duplex)$1075 - Income, Monthly (actual)$532.37 - Expenses, Monthly (estimated)$55,000 - Price, Informal Discussion23% - Cap Rate (Annualized Income / Price)10.7% - ROI, After Tax (annually, assuming 15% income tax)10.3 Yrs - Until this property pays itself offProperty Delta (SFR)$875 - Income, Monthly (actual)$492.37 - Expenses, Monthly (estimated)$48,000 - Price, Informal Discussion22% - Cap Rate (Annualized Income / Price)8.8% - ROI, After Tax (annually, assuming 15% income tax)13.6 Yrs - Until this property pays itself offProperty Echo (SFR)$770 - Income, Monthly (actual)$471.37 - Expenses, Monthly (estimated)$62,500 - Price, Informal Discussion15% - Cap Rate (Annualized Income / Price)4.1% - ROI, After Tax (annually, assuming 15% income tax)24.4 Yrs - Until this property pays itself offNotice how the price keeps going up?