The process from start to finish would take four months and cost ~200k to build, with comps in the area around 355k-lender man said, refinancing would take six months as most lenders wont refinance a property unless its been built for six months, affecting the strategy to get paid out from refinancing quicker and closing out on construction loan-The property would not appraise at comps value, but at the cost it took to build, affecting getting paid out from the refinance.

what kind of loan?  

Did you use a hard money loan for this? 

I have spoken to lenders about traditional financing and also DSCR loans.

Depending on person it's in the teens.

I don't know a single person who regrets starting out with a quad and house hacking.

Depending on your loan it might only work in the STR game.HOA’s normally do not allow in the Oceanside area but if you get on the beach then they do with restrictions.If you want a personal consult let me know.I have a team here in Oceanside, Carlsbad.

BUT.... but, but, but, also how a person manages will impact this.

I've seen many investors get burned because they failed to understand their hard money loan terms/rates, even if they did acquire what should have been a home run deal. 

I would personally use some of that equity and get started with your first property.