Live, Laugh, Larp
Deflation can be even more destructive than inflation. It would basically make all kinds of debt more expensive, to which real estate is particularly sensitive. There’s a chance that could force over leveraged property owners to sell, but with more expensove debt, there will be fewer buyers and it would tend to be those who can take on the higher risk (aka the already wealthy).
All that is to say, I don’t have a solution either (especiallly if high taxes on non-dwelling properties doesn’t seem to be making an impact), but deflation is almost never good…
Man, I really want to love Millenia. It feels like it has so many great ideas mechanically (from the ages mechanic to how resources work domestically and internationally), it just seems really rough at the moment. The pacing feels off and the flavor comes off just bland (none of the civs seem to have much character).