That would be a game changer is you can use it to buy your second home. 

Will they finance 100% of the purchase and renovation or will they want skin in the game (you putting money in).Most do not do 100% funding so beore going down more rabbit holes, make sure you have the $ aspect situated first.

Address Your Financial ProfileBridge the Revenue Gap: Highlight your equity in the duplex and use your sale proceeds to demonstrate “skin in the game.”Partner to Compensate Experience: A financially strong and experienced partner can help offset your limited track record.Focus on the Land Deal: Secure the land at a good price, as it’s a crucial step in gaining credibility and attracting partners.Final ThoughtsYou’re entering an exciting and impactful space in real estate development.

Since you already know the metrics in the fix & flip game, this might be an avenue for you to consider.

Real estate is a long game :)Food for thought, especially with a family.  

And do you think you're the only game in town?

Good listings are a people game, not anything you have at the bottom of your post.

Price fair, don't get greedy, play the long game.

When it comes to the STR game, differentiation is critical, and that can be challenging with a 550 square foot oceanfront condo. 

Quote from @Tom Hall: My mortgage rate is very high  and I would like to pay some of it off, so that my monthly payments would go down a bit, I dont know if it is financial smart to do it or not?