Hi @Andy T.!
I'm also an investor and realtor in the Milwaukee area. At that price point in 53207 I'm assuming it's in Bay View? If that's the case at least you're in a great area that continues to see steady growth.
Some immediate questions I have about this situation:
1. What's the projected ARV of this property? Did you have this discussion with your realtor ahead of time? If not, it's very important you have a target ARV in mind before going into a deal...especially if you're planning to BRRRR.
2. What work needs to be done to bring the property to that target ARV and what does that work look like? From personal experience just replacing appliances isn't going to add much value to the property. Cosmetic remodels like paint, new flooring, new kitchen/bath will add more value and ideally the units are a bit outdated so it makes sense to do these updates. It seems like your 1500 unit is already in pretty good condition while your 1350 unit has some room for updates.
3. What's your monthly cashflow going to be with the additional HELOC payment?
If the property is in great condition and you have no major capex coming up soon and you're financially comfortable and able to support this mortgage and HELOC until you pay the HELOC off, I would hold onto it. At -200 cashflow per month, that's "only" $2400 per year. Your mortgage has still been paid down more than that and while I don't have a crystal ball and you should not bank on appreciation to make a deal make sense, Bay View is in high demand. Rates are on the decline too. Does your bank offer a free refinance after 6 months? Play around with how refinancing later in this year might affect your monthly payment.