But if you're willing to give up some cash flow for the prospect of greater appreciation, you can come out ahead in the end because the increased taxes could be more than offset by appreciation.

The rates are "good" with huge potential to increase.

I am hoping this will increase my holdings and reach my financial goals in a shorter time period than residential.

This dramatically increases the economic benefit for the investor. 

That's the SIMPLEST way to increase yield: Lower down payment.

Do they increase or decrease due to supply or what?

Hey Ron I'm an investor in Nashville, and with the market booming the way it is with the population increasing one thing a lot of investors say is the demand is high and the supply is low making this a sellers market.

I personally was targeted by a tenant group that spammed my google reviews trying to avoid a small rent increase....those reviews are not as telling, but management never returns calls, property owners complaining of similar things are very telling.

What other options do I have besides a HELOC (which I am also considering, but holding off on because my mortgage payment is so low and I know with a HELOC it will increase).

@Caleb Heimsoth Right when we bought the condo the HOAs increased by 15%.