Aerial of 64 Mowbray Avenue, Bay Shore — the Penataquit Canal running to the Great South Bay

Penataquit Canal · Bay Shore

Sixty-four Mowbray.
The estate with its own marina.

More than 180 feet of canal frontage, thirteen private boat slips, three residences and a resort yard — at the end of a cul-de-sac, with Fire Island on the horizon.

Offered at

$2,000,000

The Compound

Some waterfront you look at.
This waterfront works.

The owner found this property the way the next one will: by boat. He kept a slip next door, watched this compound come alive each season, and when it came to market he never left. That was more than two decades ago.

What one deed holds here is something the South Shore almost never offers: a legal triplex of three residences, a private thirteen-slip marina on 180-plus feet of bulkheaded canal, and a resort yard — in-ground pool, in-ground hot tub, brick outdoor kitchen, paver patio and palms — at the end of a quiet cul-de-sac, minutes by water from the open Great South Bay.

Nine bedrooms and nine baths in all, five of them private en-suites. The whole first floor of the main house runs as an owner's residence opening to the pool and the water; the suites above, the cottage and the garage apartment earn. It is a vacation estate and an income property refusing to choose — and pulling both off.

From the listing

“A rare opportunity to own a high-income producing property in an unbeatable waterfront location.”

At a glance

OneKey MLS

#1035730 · Active · On market August 6, 2026

Three residences, one deed

Live in one.
Let the others pay for it.

Matterport

Walk every room
before you drive out.

A full dollhouse-and-floorplan scan. Drag to look, click to move, and switch to the overhead view to read how the three residences fit together.

Open the tour full screen

The Water & The Grounds

A hundred and eighty feet that do
most of the talking.

The Income

A vacation home that earns.

Two independent engines, both running today: a marina that rents by the foot every season, and residences carried by long-standing occupants at legacy rents. Figures below are owner-reported and approximate; the full rent roll and slip roster are shared with qualified buyers.

Gross annual income

±$150K

Marina + residences, as currently run

The marina

±$42K

13 slips by the foot in season, plus winter storage

The residences

±$108K

Suites, cottage & garage apartment — legacy rents with upside

An illustration

The ownership math.

Purchase price$2,000,000
25% down$500,000
Est. monthly carry (PITI)*±$13,500
Gross income, monthly†±$12,500

Occupy the entire owner's floor — pool, water, the slip of your choosing — and the existing income offsets nearly the whole cost of carrying it. Raise the legacy rents to market, or open the owner's floor seasonally, and the property can carry itself outright. For qualifying buyers, depreciation on the income portions may shelter income beyond the property itself — ask your tax advisor.

*Illustrative only: 25% down, 30-year fixed at prevailing jumbo rates, taxes $37,559/yr, insurance estimated. Obtain your own financing quote. †Income figures provided by owner, approximate, not guaranteed; buyer to verify. Not tax or investment advice.

For the buyer coming from the city

Four reasons this one is
worth the look.

Location

On the canal.
Minutes from everything.

The Penataquit Canal sits between Bay Shore's revived Main Street and the open Great South Bay. The Fire Island ferries leave from a few blocks west; the LIRR is a five-minute drive; and the bay itself starts at the end of your dock.

How far to what matters

Distances are straight-line miles from the parcel; drive times are approximate.

From Manhattan

Half the drive of the Hamptons — and you arrive at a dock.

Times are typical published figures and vary by season and schedule.

The Market

What the numbers say
about two million.

Recent closings, ZIP 11706

Address Closed Price

Closed sales reported to OneKey MLS. Comparable sales are provided for context only and are not an appraisal or a representation of value.

The short version

The top of Bay Shore trades to $2.25M. None of it came with a marina.

Eight mainland closings at $1.3M and up in the past twelve months put $2,000,000 squarely inside the proven band — and unlike every one of them, this offering arrives with thirteen slips and three income-producing residences attached.

Private Showing

Come see it from the dock.

Showings are by appointment. Qualified buyers are walked through the full financials — rent roll, slip roster and carrying-cost models — before or after a private tour. Send a note and you will hear back directly from the listing agent, usually the same day.

Peter C. Grosso

CBR · Licensed Real Estate Broker

RE/MAX Integrity Leaders

Request a showing

Your details go only to the listing agent for this property.