CI SEA is a late model 2021 MJM 53z, designed by Doug Zurn and proudly built by Boston Boatworks. The 53z is the Downeast inspired flagship of the MJM line and features expansive single-level entertainment spaces between the pilothouse and aft decks, luxury private accommodations for four, impeccable engineering and construction quality; and truly impressive performance - all key attributes for the discriminating buyer.

The current owners acquired CI SEA in 2022 when almost new, and they have spared absolutely no expense in maintaining and updating this impressive yacht. Recent upgrades include new updated Mercury quad outboards with extended warranties, all new Garmin nav electronics, canvas, fabrics throughout, aft deck teak sole, deck non-skid and much, much more as noted herein. Without a doubt, one will be duly impressed with her condition and extensive features upon inspection.

INTERIOR

The interior features finely crafted cherry joinerwork including cherry paneled or louvered cabinet doors, solid drawer fronts, and solid trim throughout, finished off in satin varnish. Large surfaces are optional varnished cherry veneer. Cabin soles are gloss teak with wenge inlays for a sharp look, with removable soft white overhead panels. There are also custom removable cabin sole covers in a laid teak deck pattern.

The décor details for CI SEA were tastefully updated in 2024 including custom fitted bedspreads, mattress covers, shams and accent pillows for each cabin. There are also numerous new throw pillows for the pilothouse and aft cockpit.

Two steps down the companionway from the pilothouse brings one to a generous galley to port with the private guest cabin starboard and day/guest head with shower. The spacious full-beam master cabin with private access ensuite head and shower is forward.

GALLEY

Corian countertops with recessed sink, cutting board cover and pullout faucet

(3) Flatware and utensil drawers with organizer trays

Vitrifrigo stainless 5.5 cu ft. 2-drawer refrigerator

Isotherm freezer compartment forward with top access

Dedicated drop-front trash bin under counter forward

Under-counter storage locker aft for large pots/pans and cleaning supplies

Wolf 2-burner induction cooktop

Breville toaster oven

Extended shelf with storage cabinets and grab-rail fiddle above galley

Skylight hatch and opening portlight to maximize light and ventilation

GUEST CABIN

Double berth with memory foam mattress covered in UltraLeather

Fold-down desk

Upholstered reading chair with arm rests

Side table with drawers and reading lamp

Large, fixed hull portlight with shade, opening portlight and overhead hatch with screen and shade

Private access to guest/day head

FORWARD CABIN

Fixed island queen berth with memory foam covered in quilted Ultrasuede

(4) Below-berth storage drawers

Storage shelves outboard berth each side

Cherry framed forward bulkhead with (2) recessed bookcases and double access doors to large forepeak anchor locker

Reading chair with arm rests upholstered with UltraLeather

Cherry desk/dressing table

Hanging lockers each side with storage shelves above

Private head and ensuite shower

Full-length dressing mirror on forward face of entry door

(2) Fixed hull portlights w/ shades, opening cabin port, and (2) large cabin top hatches with screens and shades for enhanced light and ventilation

ENSUITE OWNER AND GUEST HEADS WITH SHOWERS

Corian counter with white Corian oval sink

Glass enclosed shower with seat

Dometic electric toilet with freshwater flush

Under-sink storage locker

Towel rings and hooks

Floor drain to gray water overboard system

Hanging locker in guest head

Overhead hatch and opening portlight w/ screens and shades

PILOTHOUSE AND AFT COCKPIT

The spacious pilothouse is the primary operating and entertainment space – fully enclosed for efficient climate control and quiet running underway. The opening windshields, side windows and rear door and window provide a complete outdoor feel when desired. There is multiple seating including helm and passenger seats, U-shaped seating with table to starboard, and a full-length settee to port.

The Pilothouse leads aft on one level to the cockpit area that features a fixed settee, and two additional matching movable seats surrounding a gloss varnish teak table. Access to the dock is easy with side entry doors each side, and transom doors leading down to the swim platform each side.

Additional details:

Optional stainless Stidd 500, wide passenger and double wide piloting seats

Optional helm and co-pilot dash and countertops in gloss finished teak with flush mounted electronics

Optional aft sliding glass door with fixed aft windows in polished stainless frame

Optional electric powered drop-down aft starboard window

(3) Full opening electric windshields

Windshield wipers and washers

Sliding safety glass three-part side windows with tinted treatment (2024)

Drop-down Sunbrella privacy/sunshades side windows

24" Edson destroyer wheel with varnished teak rim

Footrests at each pedestal seat

Teak pilothouse expandable table on electric telescoping stainless pedestal

Pilothouse settees with blue Ultraleather-covered memory-foam bottom cushions, converting to double and single when needed

Second set of new unused white UltraLeather cushions in storage

Clear Awlcraft finished teak storage drawers, each side with locks

Large pilothouse settee lockers each side with mesh organizer bags for cords, hoses, bikes, hard luggage, dinghy, golf clubs etc.

Lockable companionway with safety latch

PILOTING & NAVIGATION

All new 2024:

(2) Garmin 8616 16-inch chart plotters at helm

(1) Garmin 8612 12-inch chart plotter at co-pilot station

Garmin GMR Fantom 24 radar

(2) Garmin GMI 20 instrument displays

Garmin Sirius XM weather antenna

Garmin Nmea 2000T

Garmin rear view camera

Starlink satellite system

Additional details:

Raymarine Ray 218 VHF

Raymarine AIS 650 tracking system

Mercury VesselView MFD controller, joystick docking, Skyhook station hold and Autopilot

320,000 Candela LED articulating search light (bow rail mounted)

Kahlenberg compressed air horn with auto fog/anchor signal

Ritchie compass

FLIR M232 infrared camera on pedestal with mast light on hinged mounting plate

ENTERTAINMENT

Fusion MS-AV755 stereo with bass woofer, (4) pairs of speakers and Sirius radio

Pilothouse optional drop-down 42” smart TV over companionway

Forward cabin 24” smart TV

Guest cabin 31” smart TV

KVH TV3 satellite direct TV receiver dome on pedestal with radar and nav light

Glomex TV antenna

ELECTRICAL

Custom backlit electrical panel with 12V DC breakers and 240/110V AC breakers and digital DC and AC monitors conveniently located close to companionway

Westerbeke 9 kW genset - 505 hours, serviced Dec 2025

110V AC system w/Victron Energy Shore power system with 65' white 50-Amp cord and Cable Master/Glendenning with remote control (2024)

Batteries: (3) Group 8D AGM - 245Ah house batteries, (1) Group 31, 105Ah/800CCA per engine (new 2022)

150 amp alternators on each engine

Blue Seas automatic charging relays

(2) Victron 12 volt/100 amp battery chargers for house and engine batteries

Victron 12 volt/3,000 watt Inverter

Galvanic isolator

Seakeeper 9 Gyro-Stabilizer

4-Zone 48,000 BTU HVAC System including optional fourth unit in pilothouse

LED house and machinery space lighting

LED courtesy lights in cockpit and head

LED navigation and anchoring lights

Dimmable, LED rope lighting in galley

12V outlet at helm and 110V weatherproof outlet with USB ports to port

Bonded electrical system per ABYC

Serviceable wiring, bundled and numbered with Deutsch O-ring waterproof connectors

Dirt Devil central vacuum system

Hella turbo fans in cabins

MECHANICAL AND PLUMBING

Quad Mercury Marine HD Verado 400 HP Gas Outboards – new 2024, 253 hours as of Feb 2026

Full service at 245 hours

Mercury Platinum warranties extended to 2032 at a cost of $30k

Mercury Active Engine Trim

Optional Reverso auto engine flush system

Sidepower bow thruster

Humphree Interceptors auto trim

Comprehensive engine spares kits and service manual

Single 920 gallon aluminum gas tank w/level gauge

(4) Machinery space air intakes

Seafire automatic fire suppressant system

Pressure hot/cold water with Johnson Aqua Jet Duo variable-speed water pressure pump

Sea-Ro watermaker (2025)

20 gallon stainless steel water heater

250 gallon polyethylene freshwater tank

Seagull IV drinking water purification filter

Dock-mate portable water filter (2023)

Hot/cold shower on swim platform

High-pressure fresh water (washdown in port cockpit locker with 50’ hose and nozzle)

(5) 110 automatic bilge pumps

(2) High water alarms

Arid Dry bilge system with three pick-ups (2023)

Dometic electric freshwater toilet system with 60 gallon holding tank, tank gauge in each head, deck pump out and macerator overboard discharge

Gray water sump w/ inspection for showers, head and AC condensate

Marelon non-corrosive thru-hulls/seacocks with oversized strainers and double-clamped hose

HULL AND DECK

Modified deep-V hull with sharp entry, high length-to-beam ratio, dual lifting strakes, chine flats and 19-degree deadrise aft

ISO (CE Mark) Certified Category A Ocean

Solid keel, stem, and transom corners of E-glass/epoxy GRP

High density core around thru-hull and hardware attachments points

Bilges painted with smooth, gloss-white finish

PVC guardrail and 1/2 round SS rub rail

Hull and deck fused as monocoque structure

Insignia white deck gelcoat with light gray non-skid, completely refinished 2024

Hull finished with Awlcraft Bentley Blue with clear coat, white boot and cove stripes, and black bottom

DECK DETAILS

Muir anchor windlass with deck and helm controls

Ultra 46 lb stainless auto-launching anchor with 250’ rode and 50' SS high-tensile chain

Freshwater anchor and rode washer control at helm

Polished stainless anchor guard and roller

13 lb Stern anchor

Retractable swim ladder

Stainless handrails on corner posts, hardtop, pilothouse, seat backs, console and companionway entrance

Stainless 30" cockpit guardrail and bow rail

(2) Custom stainless multi-directional bow chocks

(8) Opening overhead hatches on foredeck, cabin top and hardtop with dual action shade-screens

(6) Opening cabin portlights with combo screens/shades

(3) Machinery space access hatches with scuppers, overboard drains, gaskets, lockdowns and custom storage bags under hatches (2024)

Main hatch has electric operated lift and teak/stainless access ladder

Optional upgrade to Flexiteek bleached finished synthetic teak on pilothouse sole and swim platform

Pilothouse removable sole covers in a laid teak deck pattern

Laid teak decks on aft deck sole (new 2023)

Cockpit seat locker for dock lines, fenders etc.

Aft serving bar with tumbler storage and 110V icemaker (new 2023)

Teak cockpit table with cover

(2) Teak chairs and stools with padded storage bags (all new 2024)

Aft cockpit bimini (new 2025)

Custom hinged three-piece sun pad cushion forward (2024)

Custom engine covers (2024)

New exterior covers (2024)

Ensign with teak staff and retainer pin

Multiple padded fenders and dock lines

SAFETY AND MISC

ARC EPIRB

(24) PFDs

(2) Inflatable PFDs

Winslow 6-man life raft

Life ring

Flare kit

First aid kit

SUMMARY OF RECENT UPGRADES

2023

Laid teak decks on aft deck, treated and oiled

New icemaker aft deck bar

Arid Dry Bilge system with (3) pick-ups

Dock-Mate water filter

2024

Quad Mercury Marine HD Verado 400 HP Gas Outboards with extended warranties to 2032

Custom engine covers

All new Garmin electronics suite

Garmin rear view camera

Starlink system

New non-skid on decks and cabin top

Pilothouse windows tinted for cooling and sun protection

Sun pad forward

New exterior covers

Custom storage bags underside of deck hatches

(2) Teak deck chairs

2025

Sea-Ro watermaker

New upgraded bimini

EXCLUSIONS

Owner’s personal effects

Coffee maker