@Krystyna Fennelly
I assume you figured out how to get it financed. Lock in as long as possible. In my experience 5 year ARMs are most common but some lenders offer 7 or 10 years.
As for the city, check for code violations or any other records with city/county offices. Also check historical utility, water, and trash costs.
Beware tax reassessment if purchase price is much different from assessed value for tax purposes. Get to work on your insurance quote early and get a big liability umbrella policy.
Big ticket repairs that can bite you include roof, foundation/structural issues, outdated electric and plumbing, HVAC and paving parking areas. Try to understand age and condition of each. Also each apartment, do they need updates, repairs, or renovations when they turn?
Do you know people when you need a handyman, carpenter, snow removal, mowing, landscaping, plumbing, electric, roofing, HVAC?
Do you have a standard lease agreement? What’s your application and screening process? How will you advertise vacancies? How will you do bookkeeping and accounting?