What should I sell my investment property for?

[Walter Correia]

My wife and I own a 3 family home in the town of Lancaster, Massachusetts. We got an appraised value last year in November of 320k while we were living in one of the units. We currently rent the 3 units for a total of 3,800 per month average expense is 2,550 including mortgage and taxes, water, heat, and snow removal. These expenses are averaged high to give us a better idea. Our cash flow is average 1,250 monthly,, yearly 15k. We purchased the house at 283,500 back in 2015. The roof is 10years old, boiler is 11 and works efficiently. The house has been renovated through out. Newer windows, carpet, hardwood floors and Laminate flooring, newer cabinets and appliances. Pretty much the house does not need anything to be done for year. It's a total of 2,100sqft with a finished lower level unit with 1,100sqft totaling 3,200 square feet. How much should would I be able to sell the house for? It's hard to find a multi family in the town.