AN, one need only examine the old downtown courthouse basement records on microfilm to see where all the construction defects were in SD County. Until you do this for yourself, you are talking out of your ear.
As far as the accoustical ceiling, I have personally helped friends remove it on problematic ceilings in MM in houses that did not have enough walls, IMHO. Granted, this was quite some time ago and many more owners may have removed it by now.
btw, MM is not the only area that suffers from heavy acoustical ceiling and “dated” stair rails. There are many other areas where these “appointments” were the norm in ’70’s and ’80’s building. But MM is the only area in SD County where I have seen no walls between the kitchen/LR/FR with only a change in floor covering.