There's a particular kind of Cambridge house that gets quieter as you move through it. The street is a one-way residential block off Mass Ave, the front facade is butter-yellow clapboard with a low forest green picket fence at the sidewalk, and by the time you've walked through the entry and into the kitchen at the back of the house, you've also walked into a garden so deeply layered with maple, asian magnolia, lilacs and wisteria that the city has effectively gone quiet behind you.

This is 9 Orchard Street, in the heart of Porter Square. It's an 1860 front-gabled clapboard house with Greek Revival elements, expanded in 1981 with a rear addition that pulls the garden directly into the house through a wall of glass. The result is a house that holds two architectural centuries in one frame — Greek Revival at the front, Bauhaus-inflected modernism at the back — the garden threading through both.

You enter onto decorative hardwood floors bordered with perimeter inlay. The first thing you see is the staircase — a graceful curve up to the second floor, the architectural anchor of the entire house. The second thing you see is the sightline. Straight ahead, the eye carries through to the kitchen at the back of the house. To the right, living room flowing into dining room, then into the 1981 addition.

This is the move that defines the floor plan. The entry doesn't deliver you to a single room. It delivers you to the whole logic of the house at once.

The numbers: 2,873 square feet on the main two floors, plus a finished attic of approximately 660 additional square feet, for a total of eleven rooms across three levels. Five bedrooms: three on the second floor, two more in the finished attic. Two full baths and a half bath. The attic is genuinely finished space, with five skylights and built-in bookcases lining nearly every wall.

The living room sits to the right of the entry, flowing into a dining room with a built-in window seat tucked into a bay where wisteria climbs the exterior in season. Both rooms keep the inlaid floors, the ceiling height, and the quiet formality that mid-19th century Cambridge does so well — but they're not precious. The house was clearly lived in by people who used every room.

The 1981 addition is the bridge between the classical front of the house and the garden behind it. It's anchored by a Vermont Castings wood-burning stove and a wall of floor-to-ceiling sliders that opens directly onto the brick patio. The bay window beside it is wrapped in wisteria. The wood stove flue rises through the second-floor studio and continues up into the finished attic, carrying residual warmth on its way.

Set at the back of the house, the kitchen reads as the natural center of daily life rather than a showpiece. Stainless steel appliances pair with older details — a marble pastry inlay, a deep plant window projecting outward for herbs and morning light. There's basement access, a full bath off the kitchen, and a rear "morning staircase" that lets the house be used from multiple directions at once. Built-ins appear at nearly every transition: storage under the main stair with drawers, shelves, and coat hooks for the routines of daily life.

The kitchen and baths are dated. They've been priced into the listing as a renovation opportunity for a buyer with vision. The bones are there.

Painted stair treads under a runner lead to a floor that continues the craft-and-utility logic of the rest of the house. The main bath centers on a clawfoot tub with hand-painted Dutch-style decorative tile. The primary bedroom faces the garden, with a built-in bifold closet wall and a bird's-eye view down to the birdbath and the canopy beyond. Two more bedrooms sit on this floor: one with a deep, dual-hung closet, one larger room at the rear wrapped in three garden-facing windows with built-in wardrobe storage and an adjacent half bath that incorporates the laundry.

Off the primary, an artist's studio pulls soft diffused light through a floor-to-ceiling window matched to the one in the addition below. It's the kind of consistent illumination painters spend years looking for. The floors are ready to accept paint drips and projects: this is a working studio, not a staged approximation of one.

A staircase with a simple rope handrail leads up to the third floor. The space opens under five skylights into something almost nautical in feeling — flexible, light-filled, and lined with built-in bookcases that run nearly the full length of every wall. Two bedrooms sit up here. The wood stove flue from below continues up through the space. At the bend in the stair sits a small display shelf, seemingly made for a single piece of art.

The garden was designed by Soren DeNiord of Portland, Maine, and the cedar-and-bamboo fence that encloses it was built by Green Futures Bamboo. A large silver maple anchors the yard, providing deep shade and real sound insulation from the street. An Asian magnolia stands closer to the house. Perfectly square stone pavers form a path along the hedge line. A brick patio gathers the seating. Layered plantings: lilacs, rhododendron, ferns, lily of the valley, vinca, alliums, give the space the established, sheltered feeling of a garden that has been cared for over decades. Standing back there, it's genuinely difficult to believe you're moments from Porter Square.

Two systems are worth naming. In 2014, the oil furnace was converted to gas-fired forced hot air, with two-zone central air conditioning added throughout the main house. The same year brought a full basement fortification: spray foam on the exterior walls, fiberglass in the ceiling, and an on-demand water heater. These are real assets, the expensive, invisible work has been done.

What remains is the cosmetic and aesthetic layer. Kitchen and baths are dated. The roof is asphalt shingle and approximately twenty years old. Five skylights need re-flashing. The 1981 addition is on piers rather than a poured foundation, and its upper level is under-insulated. These are conversations for an inspector and a contractor. They're also priced into the number.

Porter Square is around the corner. The Red Line and the commuter rail both stop at Porter station — Concord one direction, downtown the other. Davis Square is five minutes the other way, with Thai Sugar and Spice, The Painted Burro, and The Abbey close at hand. The neighborhood around Mass Ave is a panoply of commerce: coffee, books, restaurants, gyms, groceries, the Porter Square Books store, the basement Japanese pop-up that always has a line. It's a particular kind of urban density that Cambridge does well: walkable, intellectual, slightly bohemian, and serious about the next meal.

This is a Cambridge house with character, scale, and a garden you'd plan a Saturday around. It needs work in the right places, and the work it needs is the kind a buyer with vision will want to do anyway.