No, I’m saying we already have part of what you’re asking for, but phrased oppositely
“ tax rates double for “investment properties” being rented out / not lived in by the owner”
Similar to
Tax rate is same for all, but those living in it are taxed on reduced assessed value
My towns website says this year the exemption is $285k, so for houses worth $570k, it’s exactly what you’re looking for: landlords taxed double… if there are any such houses. I know there are at least condos for less, so those people get an even bigger break on taxes than you’re asking, vs what a landlord would pay, and it’s theoretically possible some pay no tax at all for living in their own home. You could easily argue this approach is better than yours, since it works even better for low income, although that exemption should be even higher, given the high costs of houses here