The building is currently owned by my Mother, Aunt, and a 50% third party.My Aunt and their 3rd partner are interested in selling while my mother is interested in holding the property.

Buy a duplex or SFR with mother-in-law here in our area and house hack.

(If the PM is your mother you can keep her. 

I enjoy the work that I do but the catch in my unique situation is that I am married to a traveling nurse and for the last two years we have been on the go moving from city to city across the US, specifically the west coast.

Maybe more if we furnish it for traveling nurses etc.  

I’m the executor of my mother's estate, which includes an old farm house. 

It's under his deceased mother and deceased uncle's names.

I would however keep your mother as the owner of the LLC so you can get the step up basis upon her death.From the C corp you take management fee and you can also "hire" your mother to do some administrative task for the corp and give her salary and fringe benefit.

Rent is 83K (54k from residential units-rented by nursing home-, 21 from the retail, and 7k from the garages), NOI is about 50K.

There is an old loan lien still on the title, which I will be researching (I believe it was paid off & no payments have been made for years -- both parties have passed away).IF I proceed, my plan is to -a) do a quit claim, with heir signing over ALL rights to the property into the escrow (both as heir to his mother and as heir to his brother), delivering possession of the UNOCCUPIED property and in exchange recieving 50-75% of the price in cash (the quit claim & delivering possession MAY have to occur at different times.