However, he also knows exactly what I’m looking for and will often run interesting scenarios by me that are just as unique as I am.

I would not use the owner to manage your units, it is clearly a conflict of interest as his units will be priority.To increase cash flow and equity ( assuming your units can be assessed without regard of the other units no belonging to you. 2 options: get a professional management company or hire a person smart enough to take the task, teach them what you expect and tie the performance of the asset to their compensationie: filling vacancies, lease renewals, and property accounting, repairs maintenance etc.

Hello BP Family,Apologies in advance for the lengthy post, but I have a rather unique opportunity at my fingertips that is a once in a lifetime opportunity and I'd love to get as much advice from as many savvy real estate investors as I can. 

Sounds like it's working out quite well for your family, and it seems like a unique house given the sheer size. 

Now I’m tasked with trying to manage the properties, but it is becoming overwhelming and impacting my family.

Maybe this is a unique local term. 

I do have an assistant that can help me throughout the day, what kind of tasks can i delegate for her to complete to make my hunt for deals easier ?

My first task at hand is understanding possible lending options that would be available to me based on type of property and location. 

Vegas is not unique.

California has a filing requirement for single member LLC's which are unique to other states.3) You mentioned not doing the books for your businesses.