Granted the 70 percent can be adjusted to fit a specific market. 

This will save a big chunk of cash for future investment and may shorten your investment time table.If you were already loaded down with lots of debt, or were getting much higher interest rate, or adjustable rate, or for a shorter period of time, or you were in the pre-retirement phase of your investing career, then the answer would be different.

Perhaps this is what all of those "foreclosure data providers" will give to you, but I got the itch to write some web programs and I've got some ideas.

When researching a foreclosure I would think you would want the ...

If we got a Nor Cal Cost of Living Adjustment, I'd make $300k right now, but that isn't going to happen.I could make $20k less a year in say Dallas, but be able to buy a mansion at $400-500k.

Is there a software solution that will automatically import income & expenses from a management company's software?

I see no recourse, and wouldn't automatically assume you're entitled to money back that you already paid for sensing, permitting, etc.

You might want to use an online rent collection utility to automate the process:  automatic ACH deposits to save trips to the bank, late fee management and rent reminders.

My leases automatically renew for another year on the anniversary.

Furnaces generally do not need cleaning or adjustment on a regular bases. 

On top of that, I get 3.6% a year depreciation with is an automatic writeoff whether I incurred the CapEx or not.