This includes our primary home mortgage, food, gas, car expense, home bills, cell phones, restaurant budget, entertainment....

I don't think I want to invest in more real estate in this area as I am afraid a earthquake would wipes out my eggs basket.Another mortgage seems like a lot, I think I am reaching my limit... but definitely something to think about.

Each little piece of info is in it's own cell.

You can sell all of them and use a 1031 exchange into a completely passive TIC deal that pays out a check each month/quarter.You can buy and sell without holding, pay your taxes as you go and build up a retirement nest egg.

Google voice for the office and my cell for actual tenants.

, bite the bullet and get an accounting software package - - at least you can generate reports correctly and start to see that you may have entered data in the wrong places.Excel can do the job - - If you aced Accounting 101 AND master all those formulas and cell referencing technique.Upon install, run the Wizard and pick Real Estate or Rentals to setup the accounts for you. 

We have been through a few renovations of older buildings (1937 would not even be considered middle aged around here) with {live edged} planked sheathing - some balloon framed, some more similar to modern construction.In your situation, I would take the entire wall section back to the studs and outside sheathing and use a closed cell spray foam insulation {if budget allowed, I might take the entire side of the house or entire house back to the studs}.

From what I understand, a cell phone is not listed property and you do not have to keep track of personal/business use.

And all of your eggs, presumably, are in the one basket so there's no amelioration of risk with diversification.  

The investor's name was Rich and Rich gave his cell number to every single person who asked.