We are obviously at the very beginning stages of all of this and there are a lot of things that we will be checking into with the city, insurance companies, paintball gear suppliers, etc, but the simplified version I see is:Initial planning and setup is very hands on butCan be managed with young/cheap labor once set up10 acres owner financed, only about 4 acres needed for paintball, 1 for their building5 acres available for other creative highest and best use scenariosProfit from paintball isn't really the point as we are continuing our business and other endeavorsIf the paintball field can pay for itself, pay for the land, and give us a few acres to play with in the meantime, is there a negative side I'm missing here?

I don't think you have any problems unless money has crossed your hands.

People get transfers, divorced, a whim to move...it isn’t a problem after a year.

require it be in your hands by the due date. 

Also if this is your first deal and you estimate 15k in rehab, I would have double that on hand before starting the project. 

Nothing in this section shall be deemed to affect the legal status of a secondary dwelling built with a lawfully issued permit if the property is subsequently transferred or sold, or if the one-family dwelling or secondary dwelling is subsequently rented or leased.https://library.municode.com/ca/san_jose/codes/code_of_ordinances?

I hand it to all you guys that are able to invest across 6 state lines. 

On the other hand we are talking about a potential 100% percent loss.Most people on biggerpockets would never hold a long term investment without fire insurance because they cannot afford a total loss. 

If you don't have a bank that has a branch in the area of the property, have them mail it in (get a money order), but ensure they know that the post mark date is not the date used for determining late payments, it is the date that the rent is in your hand that is the date used for payment of rent.

Property taxes will be about $2,300/year.I'm looking for advice to simplify the mechanics of purchase and transfer to our daughter.