Prospective buyers find few options in Hub housing market

Teaching prospective homebuyers to navigate purchase and sale agreements, pay off mortgages, and cough up closing costs is the easy part.

For staffers at many community organizations, the hard part of administering the city-sponsored Homebuyer 101 course is watching graduates fail to find affordable homes in Boston.

The course, administered by 15 organizations citywide, teaches low- and moderate-income people the ins and outs of homebuying.

City residents who pass the course, which lasts ten or more hours, qualify for government assistance with their mortgages if their incomes fall below a certain level.

Despite governmental assistance, however, many …