Here are a few definitions:
Medium High Residential Zone (MHR) â€“ (eight to 12 dwelling units/net acre): This zone is intended for a wide range of residential development types including detached single-family and attached duplex units at the low end of the density range and multiple-family attached units at the higher end of the density range.
Another MHR2 definition could be meant for manufactured housing, with 2 meaning 2 lots accommodating.
In this case, MHR2 is a land line valuation- with only .31 acre being under this zoning. Find this here: http://data.visionappraisal.com/DerryNH/findpid.asp?iTable=p
These are my guesses. To be on the safe side and to be sure you know ahead of time what you'd be purchasing call David at the Derry, NH Assessor Department. His page/info is here: http://www.derry.nh.us/pages/DerryNH_Assessor/index
I hope I helped and didn't confuse you more.
Prudential Verani Realty
Nashua, NH 03060