Need advice on offer.

[Rony Daniel]

We are currently renting a 2500sq feet in a 7500 sq feet building at $16/ft. With NNN we end up paying around $4,200/mo. A private equity group just bought out all the buildings in the area we are in (15+ buildings). I asked our leasing agent to reach out to the private equity group to see if they would be interested in selling the building itself. They responded they are open to offers but do not want to put a price out there.

They have 13 executive offices that occupy 3,000 sq feet and brings in around $7,500/mo or 90k/year.    They calculate around $4.1k/mo in expenses or 50k/year. (insurance, admin, repairs, prop tax, utilities, etc). Trying to come up with an offer for the building, It's around 25 years old and in good condition. The exec offices were just newly renovated recently and looks amazing.  

What's the most I should be willing to pay for a property like this?  We are currently on a 5 year lease with 3 years left and most likely will renew.