I think there is circumstantial evidence on the cause, but since it doesn't necessarily support the position of the fire chief that ALL homes, not just high rise condos, should have sprinklers, it is possible that it won't be made publically available, at least no time soon.

To me, the city can't decide to force anyone to bring their dwelling up to current code unless they are doing substantial modifications and applying for a new building permit. If they do mandate changes that were not required when a structure was built, they need to provide a means to pay for it. Otherwise, it's a "taking" that would allow the property owner to sue for compensation.

Buildings like Marco Polo will only do retrofits when they find that they can't get insurance without it, or that the insurance costs more than a retrofit would. Even then, it's one thing to mandate that the common areas retrofit, but how do you force each owner to do so in their own condo unit?