We just flipped one where the owner was advertising on a local ads site.

Would you broker out the commercial property or self-advertise?

You can add a $100 line item on the rent collection for water, or simply increase rent and heavily advertise that.

As a layperson, you are not:"No individual, other than a member, in good standing, of the bar of this commonwealth shall practice law, or, by word, sign, letter, advertisement or otherwise, hold himself out as authorized, entitled, competent, qualified or able to practice law; provided, that a member of the bar, in good standing, of any other state may appear, by permission of the court, as attorney or counselor, in any case pending therein, if such other state grants like privileges to members of the bar, in good standing, of this commonwealth." 

Another person just a few blocks from me is also absolutely crushing it with his Airbnb in "The Hood" by putting "A Tiny House" on his (very) small lot on his property and is advertising The Tiny House Experience.

You will have taxes, insurance, maintenance, utilities, collections, advertising, etc.Also you need to consider whether you will really be able to raise rents on a half vacant property and generate enough demand to fill another 56 units. 

I have been hearing some advertising for turnkey companies that are selling the properties, have renters and will manage the property for you.

Did all the work my self - cleaning, floors, paint, fixtures, toilets, used appliances off CL, landscaping, advertise, applications, lease agreement, PM. 

Just because you see other units advertised on VRBO, etc.

It will take an afternoon but I have done this and found some amazing deals that the bank never advertised.