A 5-cent mint moved restaurant tips up 18%. The same lever sits unused in your apartment business. In Strohmetz's 2002 reciprocity study (made famous in Cialdini's Influence), average tips moved from 15.06% to 17.84% from a single foil-wrapped chocolate. On a $50 check, that's $1.35 in extra tip. A box of Andes mints at Costco runs $13 for 240. Twenty-seven to one on something sitting in the supply closet. The apartment business has the same setup and the same blind spot. NAA reported turnover costs jumped 17.5% in 2024. A single retained resident at a 200-unit property is worth thousands. Then RealPage studied what actually drives renewal. A resident who doesn't know any neighbors renews at 29%. A resident who knows seven or more renews at 47%. An 18-point swing on one variable: how connected they feel to the people around them. So what's the apartment-business mint? A taco truck on a Friday. Live music in the courtyard. A dog meet-up. Whatever gets two residents talking who wouldn't have otherwise. The pattern: small, unexpected, before you ask for the renewal. Many properties do the opposite. They send a renewal letter with a rent hike and hope loyalty shows up. Reciprocity runs the other way. The gift comes first. The mint is cheap. The miss is expensive.