Maybe look for a different type of tenant that doesn't leave every year or sell the place if it isn't meeting your other investment objectives.2) As PM's we always seek prior authorization for expensive turns or capital projects, even though the estimates given to our owner-clients are often ball-park numbers.

The process must be understood and applied to team building, investing your and 3rd party capital, and financial deal structure with debt and equity sources. 

Just take the loss and repurpose the downpayment capital into something better.

They have plenty of capital and just looking to park cash while diversifying.

If he rents it out for 5 years, he now has to pay capital gains tax on that $300K (and any subsequent appreciation). 

Capital calls?

Quote from @Derek Stevens: @Michael Baum My initial question was about determining a sale price not raising capital.

I am interested in purchasing more triple net leases because I now have more capital.

Originally my thought was $100/mo is so low I'm not sure if it's worth it as I'll have to put in extra of my own money for reserves and it will be years until I recoup that money but then I remembered that all in for down payment and reserves I'll be putting in ~13k of my own capital.

It's just old school working capital management that most businesses have been using for 100+ years.