I am an engineer with a full time job, but plan on continuing to purchase rent ready properties to slowly build wealth.

If you go that route, you should and will, build a relationship over time.

Its $2k to start and was wondering if it is worth for them to build the Paydex and build up my business credit. 

With one million dollars and picking up the houses while distressed and refinancing you can build an extensive STR portfolio. 

Could treat you to a nice steak dinner ( 2 years ago since prices have tripled).Just build it correctly. ( within code).Good Luck 

I don't see a prior Vacant Building Notice so from my understanding, I shouldn't expect to see a U&O.Here's an example:https://cels.baltimorehousing.org/TL_TM_MAP.aspx?

After doing a lot of research, I'm getting close to sign a contract for a new build (4bd/3ba) in the Creek Meadow area.

BUT they go into what they're currently working on, what/who they're seeking at this event, and I get a good sense of where they're at along their journey.One of the best books I read on the subject of effective networking/relationship building was Never Eat Alone by Keith Ferrazi. 

How long have they owned the building and what’s the current occupancy?

Yes, private money, but you need to build up some reps and proof of concept so friends and family can see what you have done.