Also, Credit Card suggestions for best business card for benefits / perks right now?  

Do you have tips for how to track each property?

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

See when materials get delivered, etc.This last one is debatable but It works for me.Not utilizing rewards or cash back credit cards during renovation projects to maximize ROI.

:Always do anything within the walls of escrow, i.e. pay people, pay title, pay escrow, pay invoices from termite, give a credit to a buyer or seller along with anything else. 

That is a "vacancy and credit" imputed expense even if you don't have any.

With 700+ credit you should be able to get mid to high 6s if you pay a couple points and do a 5 year pre payment penalty.

But I agree with an above poster that $10 psf in tenant improvement seems low, unless you can find a turn-key tenant to occupy that will require very little renovation.In DFW, for 2nd generation spaces, I've seen LLs underwrite at about $25-35 psf in expected TI allowance (subject to the lease terms and tenant credit rating).  

For HELOCs without W2 income, look into local credit unions or community banks, as they often have more flexibility with alternative income verification and rental portfolios.

That is something a lot of the smaller credit unions lack.