It's probably a fire-rated wall and they didn't want to go to the extra expense of adding receptacles and then restoring the fire rating. Fortunately; there is no place in the Code that says that the requirements are waived if someone is too cheap to meet them.
#100629 - 12/07/0610:53 AMRe: Common wall on condo
boxes shall not be installed on opposite side of walls or partitions of staggered stud construction unless "Wall Opening Protective Materials" are installed according to the requirements of their Classification.
And I also agree that this does not eliminate the requiremnts of 210.52.
#100631 - 12/07/0611:52 AMRe: Common wall on condo
Typically UL fire barrier separation walls has verbage that says boxes on opposite sides of the wall need some kind of fire separation. The distance used in many assemblies is 24 inches apart to say that the boxes are not back to back.
There is no good reason why the receptacles are not installed.
If sound was the issue, they make putty pads. Putty pads are also used to achieve the fire rating separation.
#100632 - 12/07/0608:35 PMRe: Common wall on condo