The Boston Globe reports the only community of factory-built homes in Boston sits on the Charles River and is owned by the residents.  The 104 unit community just received word from Mayor Thomas Menino that the city will invest $815,000 to upgrade sewers, roads and electric power lines.  The article says there are 251 LLCommunities in 106 Massachusetts cities and towns encompassing some 20,000 homesites, and suggests manufactured housing as an alternative to the cavernous single-family mansions that cost hundreds of thousands of dollars.  Massachusetts does provide first right of refusal for residents if their land lease community (LLC) goes on the market.  Noting that the state requires each city to have a minimum of ten percent of its housing affordable for low-income residents, the article suggests that municipalities be allowed to include manufactured housing units as part of this figure.  However, without income requirements for living in such a dwelling, exact figures of what is or is not affordable housing could not be determined.  In a May 18 story we published here, the city of Salisbury, MA passed a resolution asking the state to allow its manufactured homes to be counted towards the affordable housing quota.