Agreed on clarifying the legal and physical setup, but I would not dismiss the stairs as a minor detail. They can narrow both the tenant and resale audience compared with a well-arranged single-level apartment, especially at this size.
I’d compare them on one sheet: five years of known or...
How many seats do you actually need, and are you comparing occasional assessments with a continuing portfolio workflow? That could change the answer more than the headline percentage. Also ask each association whether eligibility must be maintained throughout the subscription or only verified...
One January snapshot cannot really separate seasonality from a change in buyer behaviour. The 6.7% figure might still be useful, but only if the asking price is the original one rather than the last reduced price. Otherwise you could be understating the total negotiation.