These assessment values aren't pulled out of a hat. They are supposed to be based on recent property sales in any given area in Buffalo. If you own property in areas where values are going up, then your propery value goes up and your assessed value will go up as well. Why is that no fair.
The following URL is on the City of Buffalo Website. It will give you the sales of homes in the city over the past two years. Use this to rebut your increase.
Sales Reports - City of Buffalo
Property values in select areas in Buffalo have been on the rise now for the past few years. I know because I've been watching them. When someone sells a house on your street for $200,000, when they purchased the house for $90,000 (15 years ago), that sets off a red flag to the city to keep an eye on that street. At some point the homeowners on that street should pay the same taxes as their new neighbor. Providing of course the houses are comparable. I know it causes hardships for people on fixed incomes, but it is what it is.