We estimate that we need roughly 9 more properties that generate $300 / month in cash flow to meet this goal.Currently, we are a single-income household.

Have them sign a lease (rent) and then sell them the right to purchase (own) after a 2 year period (priced at estimated appreciation).

Last second found out the Property tax estimate they used was wrong.  

Make sure to add a 5 to 10k buffer to your rehab estimate.

We estimate that the basement will cost approximately $30,000.

My estimate would be that in a house hack you would be slightly better terms on the loan.

Property Address, 2, Property Purchase Price, FICO Score, # of Rentals currently owned, Property Annual Taxes and Insurance, (IF a refinance, estimated value and purchase date), and if you own a primary or not. 5.

What is a good starting place for an estimate to completely overhaul the interior of each 900 sq ft 3br/1ba unit as current tenants move out? 

Local municipalities and states have GIS data online that reveals much of how a property will be developed, even streams can be estimated (nothing like a photo of running water tho).

$1200/unit can be possible on the east side, but I would need to see the listing and give you an estimate on rehab.