One of my tenant's portion of the rent is $7 per month while the housing authority is paying over $1,000 per month directly to my bank account for the balance of the contract rent.

Yup - I've seen this discussed, but it by-definition limits the pace that you can buy, so it's actually quite rare.It's also rather difficult to qualify for a mortgage when you have 10 properties already.

Scott's book "The Book on Flipping Houses" I'd recommend reading it.As far as finding cash flow properties, I know that's a pretty difficult if not impossible task in NYC.

I think it provides a balances approach, and allows you to gain from the benefits of the two different strategies (they work together rather well).

If the current tenanst don't renew how difficult will it be to find another tenant?

Therefore there would be a balance due.

Might be difficult

Although it's become more difficult to find good deals on listed properties, they're still out there.

You could look at the market comparables for your triplex - closing costs - your current loan balance = your net proceeds or net equity.

The bookkeeping for these should not be too difficult.