Surge protectors can be very, very bad for an amp's performance and aren't generally good for low current components either. Just about all of my important components have custom power supplies. BTW, many surge protectors will not protect against minor over voltages that can cause bad damage.
I use a PS Audio PP10. this is a power regenerator (much different than a conditioner or a surge protector).
If the surge was lightning, then that is an act of good. Sometimes your best bet is to unplug during a storm.
If it was a human error you may be able to be reimbursed for your damage. I work for a utility and it is not uncommon for a utility to pay for damage to refrigerators etc if, for example, 220 volts gets hooked up to a 110 circuit.
If it was your apartment building's fault they should be held responsible. You may have to question their explanation to get to the bottom of it.
The good news is that human errors are often corrected after they happen once so the same thing shouldn't happen again.
Jerry