Unique, mint-condition, 3-bed, 2 1/2 bath single with a gorgeous private yard & beautiful detached cottage with office, media room, and a kitchenette! The main living space includes a heated mudroom entry; an updated kitchen w open shelving, oversized walnut island, clever pantry, and quartz counters; living room w/gas fireplace; and a seamless indoor-outdoor dining space connected to the private backyard oasis with mahogany decks, rock garden, koi pond, and outdoor TV! Upstairs are 3 beds, incl. a spacious primary. Finished lower level offers an exercise/family room, temperature controlled wine walk-in & 1/2 bath. Updated systems, incl. ductless heating/cooling in the house & cottage, 200-amp electric, on-demand hot water, & insulated windows. Eco friendly porous paver driveway. Serene lot in a serene location in one of the quietest and greenest parts of Arlington, just steps to Whipple Hill trails, McClennen Park, the "Res", and Great Meadows!