The Pocasset River slips through Auburn mostly out of sight — behind the houses, under the streets — and the neighborhood above it has been packed with duplexes and small tidy lots for a very long time. Martorelli Property Services LLC looks after those properties in both directions: mowing, trimming and seasonal cleanups while the ground is soft, plowing and ice control when it is not. Lots like these leave no room for error, since a mower has to fit the side yard and a plow has to find somewhere to put snow that is not the neighbor's fence. Doing it right means the same hands knowing which gate sticks and which driveway glazes over first. What comes of it is a property that looks tended in July and stays walkable in January.