Start simple.

I'd love to dig in so I can see where things went wrong as it's almost always something simple, or backlinks weren't built properly.

Ex: once the value of the property increases by $200k according to X estimate or set of comps, we will sell the property.

I would go after one with an increasing job and population growth.

@Kainne Hansbury - Not all that great, I ended up running in to other zoning issued with the addition that I needed to increase the space to become a 3 family and am still working through those. 

Of course if increase rents by $75 to $100 per unit the CoC will increase too, but it will all depend if the location and condition of the property allows me to do so. 

As an investor and property manager in bay area, just follow the rules and vet your tenants well.Yes, the laws are increasingly skewed towards the tenants. 

As Bill mentioned, you could potentially be a coborrower for him on a cash out refinance to increase his buying power.

(they are open to increasing this limit but not without an audit of your infrastructure) . 

It may be as simple as they are preparing to list it or as complex as a divorce is happening and the seller wants to keep the sale hidden.