Can't stress often enough the problem that the unintended consequences of this bill have caused. Most people that voted for it though it would just limit the increase of property taxes on homes. They didn't realize it affected warehouses, factories, etc. It's a mess that has to be changed.
If I remember my government class, it was primarily backed by the owners of multifamily rental property. While most single family houses at the time changed hands every few years, apartment buildings were typically kept for decades.