Here's a bit more in detail about how rates are calculated for DSCR loans:1.

They could self manage for several years, using the rental income, until the next phase of their retirement.If they have a decent amount of financial discipline, they may want to get a HELOC now before they build to get the most favorable rate.

The interest rate isn't that huge of a difference between the 15 and 30 so worst case scenario if you have the 30 year option is you start paying it down on a 15 year timeline - sure you'll pay a little more in interest over the 15 years, but it will have been worth it if you bought another house.

Maintenance and potential repairs will also require a long-term financial plan and setting aside a contingency fund for such expenses.The steady cash flow, appreciation over time, and tax benefits can make a meaningful difference to your wealth in the long term, especially with the principal paydown on the mortgage.However, if managing the property from a distance feels too burdensome, or if you’d prefer the certainty and flexibility that comes with having less debt (especially given the high mortgage rates), selling and using the $100,000 in equity to reduce your loan for your next home may be the smarter move.

If it's already turnkey that means you're paying higher rates than necessary when you could put 20% down and get a DSCR loan with lower rates and fees. 

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.

I agree with William that the rate you have is probably better than you'd be able to get moving into another property with rates where they are today. 

Definitely something to clarify upfront...If you’re replacing with another restaurant, it should be an easier transition since the setup is already in place.Your biggest risk is vacancy $450K/year is solid, but if you ever need a new tenant,  ensuring the lease rate is sustainable is key! 

For lending, your rates are going to be higher than if you were to buy under personal name.

My original plan was to find a 4 plex in california buy using fha loan, move out after the first year and generate cash flow and appreciation, but after looking at properties it became clear to me that’s not possible with todays market and interest rates.