I personally have found an abundance of deals where older landlords no longer wish to own but do not want to pay the capital gains tax. 

The Sewer Charge and Water Supply Tax may be higher now.Check if you’re now subject to automatic annual rate hikes based on CPI, which could contribute to the increase.4.

Personally speaking, from an investment broker and investor standpoint, I feel single family investing is the riskiest in some investment ways in comparison to larger investments due to the fact that it only takes 1 repair or tax/insurance hike to put you under or lose all income.

Most on this forum can't even come up with a downpayment, you can't expect them to ride HOI/tax increases, vacanices, etc., with lower leverage and less cash flow on a property.

While property taxes are higher, the long-term upside is strong for investors looking to build equity while maintaining a solid rental base.If your focus is slow and steady wealth-building, Memphis, Little Rock, and Oklahoma provide great value and predictability.

If you go self-employed, youll need two years tax returns.

Are you quoting net cash flow - after taxes, insurance, maintenance/repairs, property management if needed? 

Plus, we haven't even talked about the tax deductibles, depreciation, and how the house hack has the potential to off-set your taxes, which is another aspect way of making cashflow (obvioulsy verify with a CPA).

The other watchout is if you lose your job you are required to pay the money back quickly, like 30-90 days with most 401K's or the loan gets converted to a withdrawal that comes with tax implications and penalties. 

@Josh Ball mentions, there are issues with foreign investors but, nowadays, it's not necessarily on the tax front anymore.