The house is now boarded up and vacant, with a sign on the door that the city plans to demolish it, if it is not brought up to code. 

Based on my own rehabs I would focus on Painting, Drywall hanging and repair, Vanity installation, laminate/luxury vinyl tile installation, ceiling fan and light installation, baseboard and door trim installation, window installation.

According to my analysis, the property should be generating just over $500 a month cash flow from all three doors. 

Knock on a door and say "Hi I'm Colin, and I really like your neighborhood and I'd like to buy a house here.

I manage 13 doors here in the Chicago southwest suburbs, and you wear a lot of hats when you are self managing! 

As you're focusing on buy & hold, is your primary target single doors or multiple doors?

I feel house hacking and even airbnb within the house hack could be an option to bring a larger cash flow

Manufacturing jobs around plus larger city within 30 minutes.

I use direct mail, Google Adwords, Facebook, Linkedin, Craigslist, Bandit signs, and door knocking neighborhoods.

To bring the building to rent ready at your standard, you need to spend a lot of money. typically you will be spending around 10k per door to get a reasonable standard including HVAC etc.