Purchase commercial with tenant

[Chase Olson]

I’m lucky enough to have the chance to purchase a commercial property ( office) in Oregon. The current tenant is a well know business that I would love to have stay. Issue is they are paying less than half market rent for the area. They have been in the building for over a year. Price from the seller is fair, but the only way it works is if I double the rent or slash the sale price. 
I know I’m not the first one with this issue. What’s your experience with this