For over a year, a portion of Center City Philadelphia residents who fear an interruption to neighboring Chinatown have battled against the $1.3 billion proposed construction of a new 76ers arena.  While the residential criticism has remained consistent, a new revitalization effort has sparked additional scrutiny.  In the beginning of August, 76 Devcorp disclosed the plan to construct next to the arena a high-rise building, which would offer multiple functions and a section for housing.  Of the 395 units projected, about 20% of them would be marketed as affordable to the community.