You would need to look into tax records maybe visit the probate office! 

Your entity needs to have a multi year tax record.

You'd need one helluva track record to make the bank feel comfortable that the owner/operator is going to handle a portfolio like this properly, and make good on their investment.Do you have any experience operating projects this big? 

Does anyone know of investor networking events or organizations in the Dallas, Fort Worth area?

Take a LOC + save your next down payment organically to invest elsewhere if you want to is my vote.   

The home owners association usually keeps record of all sales.

Get everything on record.

You can always later assign the beneficial interest to an LLC.The trustee however will probably be listed on the deed that is a publicly recorded document.

I am thinking about direct marketing or doing more dirty work and finding my counties' records and just contacting people. 

The triplex was built in 1997 and has original HVAC and roofing, but has been maintained (with records) yearly.