Hypothetically, if a lender wanted details about the foundation repair, you would provide evidence in the form of an invoice, green tag, and engineering report. 

I paid the invoice with my credit card.To make sure I was getting quoted a decent deal 2 other companies come out the next day. 

I also have the option that they can pay extra for pool heat and if they request sends them an invoice for that amount.

Everything done today to manage the business is done  in what appears to be its most rudimentary form - cash collection of rent, pen and paper accounting and rent roll, no background checks, zero invoicing from vendors, locating new tenants through primarily word of mouth, historically not raising rents, etc.

Without agreeing to this amount, I have unfortunately asked my property manager to send me in April 2014 an invoice for plumbing repairs and scheduled the plumber to do repair work on May 27 2014.

They also stopped updating my invoices on their site with an excuse of doing an upgrade.As of yesterday both tenants were still in place and legally being forced out at noon.

The only other thing I've heard of is someone who had a problem with the management company's invoicing system, it was a weird system or something, but that got worked out as well.

Plus, the invoices they send never have the property addresses, so I have no idea what it's for.

As a Doctor, you spend your time helping patients get well, not chasing down some past due invoice. 

I think the most valuable thing for me was the ability to have a place where I can see all of my properties and invoices.