In US metros, they’re typically around 2% of the home value, with discount maybe 50% for owner’s primary residence. Depending on the locality, the home value may be reappraised every year only only after a sale. If you bought a $100k house, planning retirement on $1000 annual taxes, and the area gentrifies your house to $500k, the extra $4k/year in taxes can be a budget buster.
Before he went national, NYC politics were more important to his business, and NYC politics - like all major metros - are Democratic.