Hi William!
I would start by checking out a few things:
1) CAN you convert the building into multifamily? Check with your local planning and zoning office to see if that is permitted on your parcel. Just because there are properties nearby that allow multifamily does not mean that it is allowed on YOUR property. You can also hire a local architect to do a regulatory review for you. They can research that for you and can also tell you what things you will need to do to bring it up to code for a multifamily property.
2) If you are not familiar with financial modeling for multifamily, I would recommend a few resources. The first is Brandon Turner's book Multifamily Millionaire (available in the BP store). BP also has a multifamily bootcamp.
3) Create your financial model to see if the deal makes sense. Figure out the gross income the property would bring in (I often use Zillow to see what the rents are in the area BP also has a rent calculator) and and subtract the expenses you will have (i.e. RE taxes, insurance, property management fee, pest control, garbage removal, utilities, repairs and maintenance, vacancy, cap ex, etc.) I am assuming you will use debt to renovate the property, so figure out what your debt service payment would be. Gross income - expenses = net operating income (NOI). NOI/ debt service payment = debt service coverage ratio (DSCR). Most lenders will require a DSCR of at least 1.2 to lend on the property.
This is a rough and simplistic model, but doing these basic calculations will give you an idea if your deal "pencils out" or not. It looks like you are a BP Pro member, so you can also use their Rental Property calculator to help you work through the numbers.
Good luck!