If over the span of a few months fuel prices increase and this tenet in the building is trying to make it a tropical 80 degrees in their unit, you are going to use much more fuel that month at a higher cost that eats you cash flow.

While the cost for a warranty eats into cash flow, the potential benefits outweigh the cost.  

Houses farther away from the city has better cap rate and CoC return, but the vacancy usually eats up profit quite a bit.Then I tried to learn more about multifamily units. 

Condos are especially known for hitting you with say $20k for assessment fees with little warning.If you have no reserves these things can eat you alive. 

BP is an amazing resource i recommend you sit in traffic listening to the podcast. and eat your lunch messaging people on here.

I personally have all my eggs in the basket of Oklahoma.

Don't eat the food off my table.8. 

I would just caution against putting all your retirement eggs in resort STRs. 

Primary issues could be issues with neighbors, you eating most of the long term costs of building maintenance if other owners don't pay for improvements, etc. 

The income allows you to save up money for down payments, and it keeps you from appearing desperate during your negotiations (needing to make a deal to eat next month).