Commercial lenders do not have seasoning periods, I work for a large bank and do commercial loans. 2% early prepay for 3 years is actually reasonable. Some lenders do a 5-4-3-2-1 structure: 5% in year 1, 4% in year 2 and so on. Your lender will most likely not waive the prepay, but ask them for "customary yield protection" instead of the early prepay they mentioned. If rates go down, you pay the change in the rate x balance x time remaining on the note (it is a very long formula that I can't really explain) but basically if rates drop you will have a penalty, if rates go up then you do not have a penalty. The bank wants to protect its interest income if rates drop, if rates go up they are happy for the early payoff because they can lend money at a higher rate.
Banks lend on multifamily based on Debt Service Coverage of 1.25x. when building is stabilized. Gross rent less vacancy (5%), less reserve budget (5%) less property management fee (5%) minus all operating expenses = Net Operating Income. Operating expenses are anything it takes to run the property: taxes, insurance, landscaping, utilities, repairs, legal fees, marketing fees, etc. Put NOI in the numerator and divide by Annual Debt Service, must be greater than 1.25x.
Costs for repairs really depend on how much asbestos you have (you might not have any) and cost to replace K&T wiring (depends if the wiring is accessible from a drop ceiling, in an exposed basement, open attic, or behind plaster walls that will require some cutting and patching. On older buildings, I pop off the electrical plates when I look at a building and look for K&T. It looks like thick brown string.