My thought was to offer her 4% or hourly rate with 4% max gross income  for Fielding calls (maintenance, emergencies, questions re policies, complaints, etc.)Inspecting units (bi annually, more in questionable situations)checking for leaks twice per year (part of inspection, putting blue tabs in toilet tanks, etc.)driveby's once per week (check for trash, exterior problems, etc.)We would do everything else.

Both very well know in the field. 

After diving into the numerous amounts of information related to real estate investing and wholesaling my vision aligned.

I also have geologist friends in the field and considered throwing them some cash and letting them do their thing, but drilling can cost millions and wouldn’t provide diversification, so i am not on that level.For mining operations, the only one I could find was Klondike Strike by Red Cloud.

I guess it would depend on whether you’d simply need to expand the drain field or replace the tank/drainfield.

There are numerous real estate pros on the site and will gladly help you in whatever capacity needed.

@Lane Kawaoka   Unless you are an expert in the field I would suggest investing with a VC fund. 

For perfectionists (and introverts), this field can be hard because you are bound to make mistakes and they will eat you up, if you let them. 

Then if there was a field for estimated tax bracket or whatever, the calculator should be able to account for the taxes on what is left of positive rental income if expenses don't account for it all.

As in any field, if you enjoy what you're doing, you will do great!