The smallest condos for sale in Arlington, Chelsea, Medford, and Somerville range from $258 to $858 a square foot, according to an analysis of Boston’s northern neighbors from real estate research site NeighborhoodX.

The analysis also found that many of these tiny condos were, in fact, bigger than smaller units found in both Boston and Cambridge.

The smallest unit for sale, by the way, in Arlington, et al, is Unit 31 at 70 Park Street in Somerville. It’s 563 square feet and asking $360,000 (or a little more than $639 a square foot). It’s pictured above. Good luck out there.

• The smallest condos for sale in Cambridge, mapped [Curbed Boston]
• The smallest condos for sale in Boston [Curbed Boston]