The tax paid from your lending proceeds should be the equivalent of your tax rate I would think.

It's debt you'd still have to pay back, but at least you will not touch one of those two amazing interest rates. 

People can't afford the extra sqft now due to the rates. 

Or at least what are investors looking for today as far as return and cap rates?

The lower rate or longer term can also make the payment more affordable. 

The combination of Germany's stable economy, well-regulated property market, relatively low interest rates, and the opportunity for long-term capital appreciation make it a compelling choice for U.S.

Quote from @Edgar Duarte: hi allI would love to get some perspective from your expertise, we have a property that we would have to sell in 2025 to avoid paying taxes on the capital gains, we believe we rcan sell it for $700K and get an equity of almost $500K after paying the mortgage balance, if we invest all of it option in index funds at 7% rate (standard com growth calculator), or in more rental properties as we are all here for, I can get the equity of around $900K.option B would be keep paying the house at 2.3% int rate while we have it in AirBnB and maybe sell it in 10 years for $900K, knowing that we would be paying taxes but it is not that bad still. or we can 1031 at that point?

For the most part, due to interest rates, breaking the 1% cap rate still won't provide positive return after expenses.

With that low interest rate, you will have paid down a lot of equity in the deal and should be able to finance with a bank.

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