Should I save and pay it off quickly or would the money be better in my pocket or in stock market?

I guess this is a perk of buying at the peak of rates now that the Fed wants to reduce rates in the near future.

As others said use low money down loan to owner occupy another and reinvest the rest into a another property/stocks. 

@Rene Hosman the answer is a bit dependent on what your future uses are.

We should have a lot less residential development being delivered in the next 1-4 years, which should shift the supply and demand for long-term residential and should have increased organic rent growth in the future as we saw from 2017-2020, but counting on that as an investment strategy probably isn't the best idea. 

You can't buy stocks for a discount just because you don't buy them at the NYSE.

That's why for deals like this, you will see people utilize bridge loans where they will lend up to 75% LTV and fund capex potentially because the property has problems and they are looking more at the future value and operations.

I know that I can keep going as an owner builder, but I also want to build new construction commercial properties, as well as having the GC license for credibility when working with other investors in the future. 

How much money do you plan to generate from this rental and do you plan to get more in the future?

I do intend to keep saving a little on the side for another future purchase but realistically don't see that happening till maybe January?