Your first purchase can be a scary thing. Be sure you educate yourself on buying rental property. So far the advice already given is very good. You can determine a price point but you need to do the sale through a title company to be sure that there are no construction liens against the property from unpaid bills by the owner who passed away before repairs were finished. Also get comps on rent in the area. You can get them for free at www.rentometer.com. That will give you an idea of where the rents for your potential building fall. If the are high, beware. If they are low, you will be able to raise them over time as leases matriculate. But if that is the case, I would insist on new leases for every tenant before you close.
Tenant history is very important. Payment history of those tenants is also very important. You may want to have all current tenants move out and start over again but that depends on their history. You will want to do inspection of the units with the person that inherited the property and your contractor to determine if the tenants are caring for their premises satisfactorily. If that is not available, then I recommend that you be cautious about the price you are willing to pay. Get price reductions for lack of data and or access.
Be sure to go to the expense of paying for a contractor to go through the building with a fine tooth comb to determine the condition of the building. You will also need estimates for completion of unfinished rehabs. Find out how utilities are handled. Hopefully all are on separate meters and billed separate to the tenants by the utility companies. If not get a history of the utility billing and learn how to best determine utilization of each unit. If trash is a dumpster then that is easy to equally divide among the tenants. To avoid potential problems, it may be wise to install separate meters for water, electricity and gas unless you have central heating. I did this with one of my properties, and while expensive, made the property more valuable when it came time to sell and I more than got my investment back. Be sure to check heating and air conditioning units. Have the roof evaluated. Those can be very expensive to replace. But with careful due diligence you can buy this property and be secure in knowing the condition, your expected work load and the expected costs. You should also check on the permits for the building as well as confirm the zoning to be sure it is permitted in the area located. I know that sounds trite but I have heard horror stories about people who did not pull required permits and no one found out until the building was sold. It was a nightmare for the buyers.
Of course you will need to know the taxes assessed and be sure you can either assume the insurance policy or get a new one. Contact an agent of your choice to get that process under way before you close your sale.
You should sign up for property management software to organize your rental process and rent collection so you are not overwhelmed if you decide to move forward. You can use the software to plan and account for rehabs and repairs. Be sure you learn to use the software and notify the tenants ahead of time that they will be given logins for access to their portals which allow them to pay rent online. I use Smart Property Systems and like it . It is easy for you and your tenants to use. You will have a way to advertise vacancies, screen tenants, automate rent collection, communicate easily with your tenants and more.
Finally, now that you have done your due diligence, do contact an agent and look at comparable properties in the area. You should find that your property compares well to others that are available for sale and then you will know what you need to know to confidently buy. Good luck!