[hahahacorn]

Parent here, sorry for taking so long to get back and thanks for such a thorough answer.

I’ll start off by agreeing that supply is the primary issue. If I had to choose between increasing supply and fucking with tax incentives, I choose increasing supply 100/100 times.

However, you’re approaching this solely from the perspective of existing multi home owner.

(The following is directed both at you, but also the other dozen comments making similar points). The entire point of this change would be to drive prices down. Because carrying this inventory is more expensive. Rent is dictated by what renters are willing to pay, not by your property taxes. What you're willing to pay is driven down by the increased cost of ownership. This leads to more owner occupied lots.

Your third option that you didn’t mention is that you sell the duplexes to one of the renters or someone looking to buy their first home and rent the other half (who now have an advantage over serial investors, and prices are lower) and you can utilize the cash from your sale to invest in other assets that don’t carry as many negative externalities to be invested in as speculative assets (I can’t buy a fucking house!!!!!!!). This is also Economics 101.

But to be clear, 3-4x property tax is too high, it would make more sense in the 20% up to 300% and scales the more you own. Also let’s just build.