Factors like high equity valuations, tight labor markets, and government spending are cited as potential contributors to inflation.

One question I now have is the following: do states typically allow you a Schedule to deduct expenses like maintenance and repair, or is that just a federal thing? 

Better income, less turnover, and less government intervention is my kind of business :)

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While private money isn't highly regulated at the federal level, there are subtle nuances to be aware of in each state that may trigger your loan becoming a security and then the SEC would have regulations to consider.

Great I will lend someone money on a home at 8% and pay ordinary income tax on that (state and federal) and also have 90% leverage on the asset.

You in no way rented to a government entity. 

See it doesn’t matter, there are no rules governing this.

A Cost Segregation study is an IRS approved federal income tax tool that increases near term cash flow by utilizing shorter recovery periods for depreciation to accelerate return on investment.

Back a couple of years ago, there were financial government incentives to install the panels as well as very low (or possible no interest) loans.