Apples and Oranges -- single family homes versus highrise multifamily structures.  No mandate on one and yes on the other.  It's silly to mandate a sprinkler system in a single family home.  It's obvious that it should be mandated in highrise multifamily structures (apartments and condos).  Govt mandate to retrofit pre-existing high rises?  That ship sailed.....unless the Govt Intends to pay for it.  I'd rather the govt invest in new affordable housing, the whole house, with or without a sprinkler system.