Sub30k seems to fit this bill, although I recognize there is also substantial risk associated with it when done improperly.

If you have more than one LLC, each LLC should have its own set of accounts.Checking: Collect all income here, then use it to pay bills, the mortgage, or maintenance.

It is of course courteous of you to give them lenience, especially in a situation like that, but at the end of the day bills are due And you have to pay them too.

If your average heating bill is $150, you may not collect enough in the winter months when the bill reaches $225 but you'll collect extra in the summer when it drops to $65.

It had 22 of the 25 lots occupied but we'll be fixing it up, filling it up, billing back water and raising rent up to market.

It might be a $50 unpaid cell phone bill from when they switched carriers.

And then I'd have to foot the bill...

That's because the city won't calculate the actual amount till a structure is built, aka it's not just a plot of land anymore.This will obvious cause your property tax bill to go up and also your mortgage escrow account as well (sometimes these things can make your mortgage shoot up a few hundred a month). 

I suspect they add this service to the tax bill but not positive on that. 

This is calculated as the total balance for each day in the billing cycle, divided by the total number of days.