The pet fee or deposit for the move in of 2 cats (you did charge one, I hope) should have just about covered the extra anyway.

Any taxes not owed, a seller merely file a tax return with the state, just like any other tax returns filed for extra taxes a government has with held. 

Any ideas on what I could turn it into to help generate some extra profit?

Does anyone know of any real estate brokers in California that offers the MLS-only membership as I don't want to pay all the extra fees to be a part of CAR/NAR.

I used all the rent and any extra money towards paying them down.

If you don't intend to do that right away then do the 20% and save the extra cash flow.

The junk removal is costing over $750 per dumpster, and they said they need 3 or 4 of them, I also have to pay extra $400+ for labor.

It may sound nice to pay a 6% management fee but the extra fees can add up to be more than the other company that charges 10% with no additional fees.

Not what you want to hear but it's the truth.

But there's something else that many people don't realize: these loans  "constant recast" during the interest-only period.For example, if I make an extra $400 payment one month, my interest-only payment will decrease the following month.