Tim O'Sullivan's Profile Photo

Tim O'Sullivan

REALTOR® | MonaLisa Team

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About Tim

From private estates to private homes, Tim O’Sullivan has built a career around an appreciation for beautiful spaces, thoughtful service, and the details that make a house feel like home.


Before finding his way to real estate, Tim served as an estate manager for some of the most
discerning clients in New York City, Vail, Southampton, and Boston. Along the way, the
classically trained musician also spent time as a private chef in New York City—an
unconventional path that ultimately shaped his instinct for hospitality, discretion, and exceptional client care.


With construction in his background and numerous renovation projects under his belt, Tim has
an eye for seeing what a property is—and what it could be. Equal parts negotiator, problem
solver, and trusted advisor, he brings a calm, hands-on approach to every transaction. Whether
navigating a competitive offer, preparing a home for market, or weighing the possibilities of a
renovation, Tim believes the best real estate experience is one where his clients feel informed,
protected, and genuinely looked after from beginning to end.


A longtime lover of architecture, design, food, and the arts, Tim is happiest taking advantage of everything Boston and New England have to offer. You’re as likely to find him trying a new
restaurant as taking in the Boston Symphony Orchestra—or heading out of the city for a hike
with his Weimaraner, Monza. He also makes time for community outreach, volunteering with
local organizations and neighbors throughout Greater Boston. For Tim, real estate has always
been about more than the property itself; it’s about the people, the places, and the lives that
unfold within them.Whether you're buying your first home, selling a longtime residence, or searching for your next investment, Tim offers a professional, approachable experience built on integrity, market knowledge, and personalized service. His commitment is simple: to guide you confidently through every step of the process while helping you find not just the right property, but the right place to call home.

Tim O'Sullivan’s Transactions

Past Sales
a living room with furniture and a fireplace

$2,404,850

4
Bedrooms
3,003
Square Feet
a kitchen with a sink a counter top space and cabinets

$2,330,000

4
Bedrooms
3,003
Square Feet
a view of a chair and table in the balcony

$2,250,000

2
Bedrooms
1,938
Square Feet
a living room with furniture and a floor to ceiling window

$1,905,000

4
Bedrooms
2,865
Square Feet
a front view of a house with garden

$1,900,000

4
Bedrooms
2,577
Square Feet
0.12
Acres
a front view of a house with a yard

$1,860,000

4
Bedrooms
2,437
Square Feet
$1,850,000 | 15 Valentine Street, Unit 8, Cambridge, MA 02139

$1,850,000

3
Bedrooms
1,965
Square Feet
a front view of a house with a yard

$1,750,000

5
Bedrooms
2,686
Square Feet
0.05
Acres
$1,518,000 | 22 Corporal McTernan Street, Unit 3, Cambridge, MA 02139

$1,518,000

3
Bedrooms
1,673
Square Feet
front view of a house with a yard

$1,515,100

3
Bedrooms
1,976
Square Feet
0.10
Acres
a front view of a house with garden

$1,340,000

3
Bedrooms
1,852
Square Feet
0.20
Acres
a front view of a residential apartment building with trees

$1,250,000

3
Bedrooms
1,605
Square Feet
a front view of a house with a yard

$1,250,000

4
Bedrooms
2,410
Square Feet
0.06
Acres
$1,225,000 | 345 West Broadway, Unit 6, Boston, MA 02127

$1,225,000

2
Bedrooms
1,616
Square Feet
$1,200,000 | 52 Walter Street, Boston, MA 02131

$1,200,000

3
Bedrooms
1,868
Square Feet
0.14
Acres
a living room with furniture and a large window

$1,165,000

3
Bedrooms
2,356
Square Feet
a living room with furniture and a window

$1,160,000

3
Bedrooms
1,459
Square Feet
$1,115,000 | 89 Kinnaird Street, Unit 2, Cambridge, MA 02139

$1,115,000

3
Bedrooms
1,020
Square Feet
Past Rentals
a front view of a house

$5,000

4
Bedrooms
a view of a house with backyard

$5,000

3
Bedrooms
a view of front door of house with stairs

$4,600

3
Bedrooms
a living room with stainless steel appliances furniture and a kitchen view

$4,500

2
Bedrooms
a view of a house with a yard

$4,300

4
Bedrooms
$4,300 | 1 Riverside Place, Unit 1, Cambridge, MA 02139

$4,300

1
Bedrooms
$4,000 | 11 Hill Street, Unit 2, Watertown, MA 02472

$4,000

4
Bedrooms
a view of a house with a yard

$4,000

4
Bedrooms
a view of a house with a yard

$4,000

4
Bedrooms
$3,880 | 6 Verndale Road, Unit 2, Milton, MA 02186

$3,880

4
Bedrooms
$3,000 | 34 Bigelow Street, Unit B, Cambridge, MA 02139

$3,000

2
Bedrooms
a view of a dining room with furniture window and wooden floor

$2,850

1
Bedrooms
a view of an empty room with wooden floor and a window

$2,400

1
Bedrooms