There shouldn't be double taxation because rental real estate normally operates at a tax loss.The potential time that there will be a tax consideration is when you sell the property.However, your resident state(MN) will provide you a credit for taxes you pay to a different state.This will avoid double state taxation.In general, California state taxes are higher than Minnesota state taxes, therefore, you will be paying the higher of the two state tax rates, which is California.

I would like to be able to afford my whole mortgage at 100% vacancy in a disaster scenario, which puts me at buying houses less than 200k at the current interest rates including expenses and insurance.

It might even be worth it to reach out to your contractor for a quick conversation. 

Home prices have increased substantially in the last couple years and interest rates have doubled.

My property manager says that we are already getting the best rates for our area.

She could have bought a second home as a rental, but with interest rates at 5%-she'd make more money keeping her money in the bank and not have to deal with tenants, so that is what she did.

Does Canada have 30 year fixed rate mortgages?  

Specifically, the areas near Wake Forest Medical School and Wake Forest Baptist Medical Center have attracted investors, as students are seeking rentals during residency.Favorable Tax Laws:  North Carolina boasts relatively low tax rates compared to many other states, with property taxes averaging at 0.70%, which is below the national average.

One of the inherent risks of new builds is locking in an interest rate.

LOL.There’s a WORSE WAY and a BEST WAY to try to obtain items 1-4 aboveBEST WAY: College or Professional Association courses in real estate (real estate license course as a base) and work experience for a REIT or other professional real estate organization and capital saved or equity raised from private parties with a MODERATE amount of debt leverage and or utilizing creative financing with low interest rate debt (may be highly leverage)WORSE WAY; Any guru courses or mentorship’s combine with high interest debt.