If you are looking for ways to track/calculate principal and interest payments, you can use loan amortization excel template, plug in the principal amount, loan date, interest rate, and the number of years to pay and it will show you the monthly breakdown/details you need to track the loan.

We are currently using Excel for the most part for tracking the rentals, and using a third party account servicing company for tracking most of the seller financed loans (Weststar). 

Daniel provided excellent insight, and just to add to it.

Wow, there are some EXCELLENT posts on here, I have voted for a couple of them. 

Hi @Amy Davidson,To me seems like a specialty item for those building a custom home, with a builder who excels with using that material.

Becca you have to do future appreciation calculation and calculating the cashflow vs capex/opex using excel .

I'd take 10 excellent properties in Nashville over 40 regular properties in Cleveland. 

It can absolutely be done in California, and although California makes it very difficult to manage properties due to tenant-friendly laws, if you know what you're doing or have a great property manager, California is an excellent place to invest due to high appreciation.

Excellent article.

It must: 1) Automatically Track my Mileage 2) Provide a comprehensive export to excel/spreadsheet for tax purposes 3) Free -any good ones free?