Black Mold in property next door

I own a single family townhouse in Bushwick, I share a wall with a mirror property that has been vacant since 2009, and is nearly falling down. Recently my wife and I went inside, as we found out the key.combination to the keypad lockbox to unlock front gate (gate replaced the front door), and besides noticing the entire place looks to be ready to fall down, two of the ceilings are covered in black mold, on two different floors. Since we share a wall, are we at any risk and/or does this give legal ground for demolition? I've gone to dept of. buildings downtown Brooklyn to ask if there was anything we could do to have it torn down, and the long answer was "no", this was however before we discovered the mold.