I know most recommend an LLC for partnership, & we plan on doing that after we get to ten loans in our own names.Can we jointly apply for a mortgage if we are unrelated/unmarried?

Hey Alex, yes, my office is in Pasadena and I do work with clients in the San Gabriel Valley; more for primary residence and long-term rental buyers and I have a healthy client base in the high and low deserts too. 

@Joseph Hazen like what @Scott Trench had to say.If you sell a property you lived in for 3 out of the last 5 years, you avoid capital gains on the 1st $250k if filing indvidually, $500k if filing jointly.

I think raising capital should have been a primary question before taking down the land, but you're here now so I'd recommend a 506 offering, or active LLC joint venture. depending on the returns, you may have to give up control to raise enough funding.

I'm a W2 employee with some savings, and my property is generating very healthy cash flows, but I'm still not close to having a second down payment saved for a primary residence where I want to live, grow my family, etc. unless I access the equity in this property.

@Kyle SwengelStill seeing healthy demand in this area near to major hospital systems.

I am also looking at doing some Joint Venture with partners who have US credit history, but I am not sure how to structure the deal through an LLC....Are there other alternatives or specific lenders I can contact who could help with financing, based on my situation?

Great indicators of a healthy market.  

The tax law does not allow legally married individuals to file single so they must file married joint or separate. 

Those are very healthy numbers!!