It contributes to the debt to income DTI ratio and makes it hard to refinance later. 

and after the fact contribute the property into a new LLC. 

I try to contribute as much as possible with my humble opinion on BP. 

Bonus step: Make sure you are placing money in your TSP as you can later pull a mortgage out of your TSP where you are paying yourself back with the interest (I never contributed to my TSP but I had many NCOs figure out this loop hole)

Its awesome how everyone contributed.  

Numbers+ CoC return on the development is looking like 10.5%-14.5% once stabilized+ Owner equity required: $1.2-1.3MM (My contractor would like to contribute their 7% construction fee + equity to get to 25% owner)+ I purchased the land outright $600k value.2.

I am leaning HEAVILY towards doing that in my SDIRA and SOLO401K where I WOULD need to make a large contribution, because of the amount of leverage I can apply.

Having a mix of credit types will show lenders you can handle more and will contribute to a higher score.

Its an interesting idea to me, but my initial gut feeling says the cash flow might be ok but it wouldn't appreciate or really contribute to overall wealth the way I would like. 

Also, there is a limit on the yearly contribution.  7k for 2019 for family coverage.