>>508693389 (OP)One of those things is, "Don't let the door hit you."
Another is, "They will physically leave but never sell their property. So you'll have the problem you always have with absent landlords, and the only solution is to start eminent domaining property as soon as you see it starting. I don't care if it's a 9-figure building, if you're sitting on it or jacking up rent specifically to hurt the city, the city has a duty to repossess it and put it to use for the good of the public."
Either way massive cellphone.