Lowell MA is a small city with a wide variety of  multi family homes for sale.  Multi Family homes for sale can start from the high 100k’s and go up to $400 to 600k for a 2-4 family home. 
Lowell has a large inventory of multi family homes, whether for an owner that wants to live in the home and collect rents or the investors who would like a steady cash flow.  Commercial multi family properties (greater than 4 units) can go for much more depending on the number of units.