A property tax is a wealth tax yes, and as you say it would be unconstitutional at the federal level, but they're enacted at the state or municipal level which is legal. At least that's the obvious position and the fact that the federal income tax required an Amendment supports that.

https://nymag.com/intelligencer/2019/02/constitutional-conce...

The federal takeover of a government-created corporation in a financial crisis to prevent it collapsing isn't really a good comparison to an ongoing process of "taking" large chunks of successful companies because their owners are required to pay taxes. And there is criticism of that control now, even if people accepted those actions were required at the time:

https://www.nytimes.com/2016/11/15/business/dealbook/fannie-...

A lot of people want to get the government out of Fannie Mae and Freddie Mac, and I'm no expert, but I think they are obviously wrong. You have a systemically important entity that has to have a government guarantee, then it has to answer to the government as at least a 51% shareholder and have restrictions on distributing profits. It seems obvious and simple and correct to me, not some sort of temporary aberration.