I think in the discussion of the Copley tower's affect on affordable housing in Boston or any luxury tower downtown for that matter what's missing is the tax revenue component. The city gets the $$$ to redo the Charlestown and Southie housing projects not from the feds but from developers building and selling the units in these new towers. Sure, it would be nice if Murph and Sully from Dorchester were moving in, but whether its wealthy Asian investors, Eurotrash trust fund brats, or Martians buying the units, as long as its generating property taxes, who cares? Delay these projects needlessly and you're starving the city of much needed funding to go and build the affordable units we all think are needed. Its all connected.