And the loans are so small lot of work for small revenue and how sustainable it would be.. 

This is not sustainable.

It’s important to know “how” sponsors are managing and getting out of some of the holes they dug themselves in and people thinking all is good because of no capital call may be in a worse position Yea, many of them being very creative, as it's almost even look like  a ponzi, so they created new fund with new debt capital stack to sustain their equity portfolio to make their equity investment side alive.

It's may also not be sustainable as compared to Long Term Rental.On the average: If you do a great job at Tenant screening, One Tenant can live you your property for 8 years.

Evaluate the debt-to-equity ratio and consider the long-term sustainability of the financing strategy.Lack of Professional Management: Inadequate management practices can lead to operational inefficiencies, tenant dissatisfaction, and decreased property value.

You will probably find there will be little cash leftover if you hire this out so I'd encourage you to try to manage it yourself to begin with then if it's not sustainable for you, try to find someone to take it on.

The three most common approaches include:Cost approach: An estimate of the replacement cost less depreciationIncome approach: Calculation of estimated potential rental incomeSales approach: Uses comps of recent transactions on similar propertiesBe sure you are leveraging the tax incentives availableIdentify any applicable tax incentives available for commercial properties - historic tax credits in certain areas, opportunity zones, environmental sustainability, etc.Understand available tax deductions, credits, and rebates - Tax deductions decrease the taxable value of a property, tax credits directly reduce your tax liability dollar for dollar and tax rebates are a refund of taxes paid under certain conditions.Utilize a cost segregation study - Cost segregation allows you to reclassify assets into categories with shorter useful lives, therefore accelerating depreciation and creating tax savings.Leverage energy incentives and deductions - Look into the Section 179D deduction and how you can save on tax by meeting certain standards to make your property more environmentally friendly.Best practices for commercial real estate owners and monitoring their property tax regulations:Plan proactivelyWork with a professional to receive guidance on complex regulationsUtilize specialized software tools to drive efficiency and compliance.What questions do you have regarding property tax valuations?

The resoning behind this is that while capital gains would be at a lower tax rate, the interest is ordinary income is taxed at a higher tax rate. 

I know 50 percent seems extreme, but considering how high things have come since 2019 with Covid demand etc, I don’t think we need an apocalyptic event to see 50 percent revenue haircuts, just a typical recession will likely do considering far we have risen. it seems like a 30 percent drop in rents will wipe away profit and anything beyond you will have to come out of pocket for assuming in interpretations correctly.if you have to go negative how long can you sustain payments?

My overall goal with real estate is to have a small portfolio of STRs and LTRs that I'd hold to sustain my lifestyle going forward.