STEAL THIS IDEA:
A 1% surcharge tax on the full assessed value of a single family home that is owned by a corporation.
Each year, the tax increases at 2x the rate of inflation.
After two years, the tax applies to all individuals owning more than two single family homes (this allows for cottages and arrangements where family members own the homes where other family members live).
After three years, the corporate tax increases at 3x the rate of inflation, then increases each subsequent year by a factor of +1. (4x the rate of inflation, 5x the rate of inflation, etc.).
This unravels the business of owning single-family homes as rental units over time, to avoid shocking the market -- as each home will cross over to be unprofitable at different times.