And once you convert it into your primary residence it is no longer eligible for a 1031 exchange. 

I own my primary residence and want to build a DADU on the back of the lot.

Most of the time, unless you bought many years ago or got some other crazy deal, primary homes don't make good rentals because you paid too much for them to ever really make any money.

My primary residence is in a trust.  

Is our primary residence and is a long term live in flip. $490k mortgage.

Hey Chris would love to visit.  100% of my business is helping clients in all 50 states with purchasing vacation homes/STR properties. 90% of my clients use the 10% down loan because the lower down payment requirement and rates/cost similar to a primary residence.

Primary residence loans are less risky than investment property loans, which is why they have more favorable terms than investment property loans.

I rented out my first primary residence in Morrison, CO in 2018, and purchased my first true investment property in Highlands Ranch, CO in 2019. 

If you are looking at 4plex you can enter that project with as little as 5% down if you buy it as a primary meaning you will live in one of the units.

I owe 400K on my current home and would be looking at 450K for a new primary.