Caused by printing money.  

Russia has already threatened Finland and Sweden and China is already making bold statements with regards to the Russian invasion of Ukraine.

I'm experimenting with my letters to get the best print and this would help!

And they got so bold they started charging private landlords fee for posting rentals.

How about printing all the money and inflating these properties to crazy highs?

The exact consumer price dynamics are far too complex to properly index in this way, even if the people who print the currency had an incentive to properly index them—rather than having incentives to understate them instead.

These times ahead are full of opportunity....maybe not for the faint of heart, but that will leave more on the table for the bold.

@James HamlingDo you think there's a chance that we might see large-scale 3D printing and robotic building of residential housing taking place in the next fifty years?

You provide the postcards pre-addressed (labels or print) and deliver to the post office when you want to send them out. 

This might depend on how soon you plan on moving and what the fine print on your loan agreement says.