So my initial HELOC I used (about 60k total used from my HELOC between the two rentals) to buy my first two rentals turned into 8 houses that cash flow me $6200/month after all my expenses now.

This creates two loan payments ($100,000 of equity and $300,000 on the new mortgage).Key NumbersHome Equity Loan Interest Rate: 6%Mortgage Interest Rate: 7%Rental Income: $3,000 per monthExpenses (management, taxes, insurance, maintenance): $800 per monthIncome and ExpensesMonthly Rental Income: $3,000Monthly Expenses: $800Monthly Mortgage Payment: $2,000ExplanationThe investor earns $3,000 in rent each month.They pay $2,000 on the investment property mortgage and $800 on other expenses.This leaves $200 profit each month or $2,400 per year.However, you have to pay $6,000 interest on the equity borrowed.This leaves you with an annual loss of $3,600.While the rental property generates positive monthly income, the interest cost of borrowing the initial $100,000 results in an overall annual loss.

I know that asking for general figures to use for estimates is difficult, but I was hoping that there was some general guidance to use when doing a quick, initial pass, knowing that it could vary when really getting into the details and project.

I was spoiled with my initial duplex and really had a great landlord experience. 

Initially, one of the most important pieces of information is the area rents.

To answer Bob's question, The verbage regarding tenant responsibility dispayed in my initial post is copied from the lease agreement signed by the teants.  

.), pertains to a mortgage-style process and necessitates the initiation of a standard civil action within the state court.

As a Project Manager, when diving into a new initiative, I'd sit down with a project charter with our VP, and ask questions to gain a full understanding of the expectations of a project.

I think it will be initiated at the state level and implemented in how courthouses record deeds, liens, judgements, etc. 

I may be able to assist in the initial zoning analysis and steer you in the right direction with my NYC connections to get the site developed.