I have a tenant who moved into my rental in California in Feb this year.

IMHO You can go with ducted minisplit systems as this is a new build and subject to the newer energy code.

It links to your checking account and credit cards. 

Is there any supporting documentation that I could have the current renters fill out prior to purchasing the property?

I was hoping to structure a deal that involves paying the seller every month and then a balloon payment in 5 years (when I can get an 80% LTV cash out refinance to put a mortgage on the property without having to put any money down because I'll have built up at least 20%).

What was your experience with this?

Does anyone have any experience with this?

Sales or leasing offices, however, are eligible for verification.I've listened to a few podcasts and heard other real estate investors mention being registered with Google so I'm wondering how they are getting around this.

They bring food and hats and other marketing materials.

I want to mail the owner and ask to buy this property.