@Marvin Briscoe,
I would suggest you forget all about the 80 year old building. If you have patience, willing to learn, and able to live without the income you may get from a rental property right now the 12 unit apartment building is the better choice. 1.46 % x 12 = 17.52%/2=8.76% cap rate.
The thing you have to make sure of is if the 12 units are all rented out now and if not what is the historical occupancy rate. If the building is mostly rented out now then it will give you a reliable amount of money to pay your mortgage and start to build up a cash reserve for possible maintenance issues. You will need enough upfront cash to purchase the property, pay your share of escrow fees and purchase insurance plus pay for property taxes. You will have to figure out how much cash upfront you need to determine your maximum allowable offer. You cannot be thinking that you will offer to buy it at full asking price of $300K with 20% down of $60,000.00 because all the transaction cost, plus property taxes and insurance will amount to more than your $60K.
The red flag is already that is has been on the market for 866 days. That is certainly enough time for experienced investors to have had a look at that building. Why would experienced investors pass on this purchase for over 2 years?
Are you sure the units are rented or are you calculating based on them being rented in the future. Sounds almost as if the building has been abandoned all this time. Are you thinking to bring this building back to life? I will ask again are there people living in that building and are those rents real? I mean if the building is really only 20 years old seems to me it would or should be in relatively good shape.
If for some reason you are able to buy and maintain the 12 unit building I would say that within 6 to 7 years you could refinance it and be able to keep going. I would not make a decision on it until you do a walk through and have it inspected and have a General Building Contractor with you at the walk through and have real estimates of needed repairs if any. Take your time with it but to me I would be considering the 12 unit building but would forget about the 80 year old building completely. With the money you have on hand I would be thinking of trying to pick up the 12 unit building for something around $240K.
I wish I could be there and over you more but since it is too far away from me I can only make suggestions based on the information you are able to give.
I would suggest you look up the property taxes on the building, Review the historical rental income, vacancy rates not what you calculate but what has been historical and accurate, review maintenance records and contact an insurance company and get a quote from them. Also pass this by a title company or somehow try to figure out what might be your escrow fees. Also your loan will be simply be $300K or whatever it ends up being lets say $240K because it may have loan origination fees, points maybe but whatever your total loan might be and what you will net can sometimes be very different based on the cost of the loan.