Set on a rare double lot in I'On with sweeping marshfront views, this 5,300+ square foot, 5 bedroom 5 1/2 bath home combines contemporary design with classic Lowcountry architecture. With soaring ceilings, refined finishes, and an easy connection between indoor and outdoor living, this gorgeous home offers both sophistication and comfort in one of Mount Pleasant's most sought-after neighborhoods.The main level showcases an open floor plan designed for entertaining, with expansive windows that fill the home with natural light. A gourmet kitchen anchors the space, featuring custom cabinetry, a generous island, high-end appliances, and a walk-in pantry. Formal and casual dining areas provide flexibility for both gatherings and everyday living. Multiple living spaces including a family room, game room, study, and a FROG offer plenty of room to spread out, while the seamless flow to the wrap-around porches, bluestone patio, and covered outdoor areas invite year-round enjoyment. The private marshfront setting, enhanced by lawn irrigation and meticulous landscaping, makes outdoor living as effortless as it is beautiful. Upstairs, the primary suite serves as a true retreat, complete with panoramic marsh views, vaulted ceilings, a spa-like bath, and walk-in closet. Two additional bedrooms each with its own private bath ensure comfort and privacy for family and guests. There is also a large FROG with an adjoining full bath. Additional features include wide-plank wood flooring, central vacuum, smooth 9'+ ceilings, a metal roof, and a two-car attached garage with ample storage. Designed with both elegance and practicality in mind, this extraordinary home blends timeless craftsmanship with modern luxury. The seamless flow to the wrap-around porches, bluestone patio, and covered outdoor areas invite year-round enjoyment. The private marsh front setting, enhanced by lawn irrigation and meticulous landscaping, and large parking area makes outdoor living as effortless as it is beautiful. One of the few homes in the Low Country that has a stunning walk out lower level, perfect for a 5th bedroom or game room with another full bathroom. This beautiful lower level has a walk out enclosed patio (with a workshop) looking out to the sprawling lot and amazing views, this home is truly a rare find!
I'On, located between Mathis Ferry Road and the Wando River, is a traditional and walkable Mount Pleasant neighborhood with a village-style center and tidal marsh views. The neighborhood’s character concentrates around I’On Square and N Shelmore Boulevard, where porches face pocket parks and a small cluster of cafes and studios sets a low-key, social rhythm. Community pillars include The I’On Club, The Lake House at I’On, and the I’On Farmers Market. Architecture leans Lowcountry coastal, with Charleston-style single houses, piazzas, and tree-lined lanes. Sidewalks stitch together greens, docks, and trails that trace the marsh edge. Water and open space shape daily routines, from paddle launches to sunset walks.
Provided by Walk Score and Local Logic
Market insights
23 Robert Mills Cir · $3,899,900
DAYS ON MARKET
374 days
The average home goes pending in 75 days.
SALE-TO-LIST
97.3%
Most homes are selling 3% below list price.
LIST PRICE
$3,899,900
Median sale price in this area is $754,525. (81% lower than this home)
PRICE DROP
4 price drops
22% of homes in this area have had a price drop in the past month.
Property details
Interior
Exterior
Finance
Kitchen
Bathroom
Bedroom
Living
Dining
Interior features
Smooth ceilings
High ceilings
Kitchen island
Walk-in closets
Central vacuum
Family room
Entrance foyer
Attached FROG (finished room over garage)
Office
Separate dining room
Utility room
Has basement
Bedrooms
5 bedrooms
Primary bedroom on upper level with ceiling fan(s) and walk-in closet(s)
Bathrooms
6 bathrooms (5.5 total)
Kitchen
Dishwasher
Disposal
Gas range
Microwave
Refrigerator
Tankless water heater
Laundry & utility
Washer hookup
Dedicated laundry room
Flooring
Ceramic tile
Stone
Wood
Heating & cooling
Central air conditioning
Heat pump
Exterior features
Garden
Lawn irrigation system
Rain gutters
Marshfront and stream frontage
Privacy fencing
Storage and workshop structures
Home design
Single-family detached home
Multi-story
Parking
Attached 2-car garage
Construction
Metal roof
Utilities
Public sewer
Dominion Energy service
Mount Pleasant Water/Sewer Commission
HOA & community
Annual association fee of $1,800
Community amenities include boat ramp, clubhouse, club membership available, dock facilities, dog park, fitness center, park, pool, tennis courts, trash service, and walk/jog trails
Electricity and solar
View estimated energy costs and solar savings for this home
BRING OFFER! Short sale possible. Must act quickly * * * If you like to entertain, you'll want to come see this newly finished beauty in the sought-after I'On neighborhood. With tall ceilings, custom wainscoting and beautifully detailed molding, this home has an open floor plan that seamlessly blends with the outdoors via oversized wrap-around rear porches overlooking the marsh. Sit by the outdoor fireplace and enjoy the sounds of nature, or entertain guests while cooking up a feast in the stunning kitchen. With plenty of room for all the cooks in your house, it features top-of-the-line appliances, including an extra wide stainless steel refrigerator and six-burner gas stove with double ovens. Bring the gang downstairs to the ground level family den, pool table area and even a fifthbedroom or study with a fifth full bath. Upstairs is the master with soaring ceilings, a gorgeous soaking tub and separate shower, and two more guest bedrooms, each with their own bath. The oversized room and full bath over the attached garage, currently used as a teenager's dream suite, could be a great home office. With a stylish European design flair, this home also includes beautiful and sturdy Kumaru wood flooring, a large mud room with built-in cubbies, an oversized two-car garage, and a roomy enclosed storage area off the ground level patio. Buyers to pay .15% (.0015 x sales price) transfer fee to the I'On Assembly at closing.
Year
Property tax
Land + Additions
Assessment*
2025
$7,230 (+20.8%)
$730,804 + $1,242,000
$1,972,804
2022
$5,983 (−9.6%)
$635,482 + $1,080,000
$1,715,482
2021
$6,617 (−3.1%)
2020
$6,825 (−1.1%)
$635,482 + $1,080,000
$1,715,482
2018
$6,900 (+1.5%)
2017
$6,795 (+5.4%)
2016
$6,445 (+48.1%)
2013
$4,351
Public record
Public record
Zoning
Beds
4
Baths
6.5
Stories
2
Lot width
—
Lot depth
—
Lot size
6,098 Sq. Ft.
Year renovated
—
Finished Sq. Ft.
5,358
Unfinished Sq. Ft.
—
Total Sq. Ft.
5,358
Year built
2008
Style
Single Family Residential
County
Charleston County
APN
5350600778
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Aug 14, 2026.
PD
Planned Development District
The purpose of the PD, Planned Development, District is to: Achieve the objectives of the Comprehensive Plan by allowing flexibility in development that will result in improved design, character, and quality of new mixed use developments that also preserve natural and scenic features of open spaces as a design component; Encourage flexibility in the development of land in order to promote its most appropriate use; Improve the design, character, and quality of new development; Facilitate the provision of streets and utilities and Preserve the natural and scenic features of open areas.; The PD District provisions must exhibit innovative site planning for a mixture of residential and non-residential uses as reflected in the PD District map, which becomes the zoning district map for the property.
Permitted uses
Include but are not limited to:
No uses permitted by right
Climate risks
5/10 Flood Factor
Estimated 49-59% chance of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
10/10 Heat Factor
7 days above 105° expected this year, 18 days in 30 years
9/10 Wind Factor
99% chance of strong winds in next 30 years
3/10 Air Factor
3 unhealthy days expected this year, 3 days in 30 years
Provided by First Street
Historical weather
Mount Pleasant, SC • 29464
Average low and high temperatures (°F)
56
37
61
44
71
52
77
61
82
68
88
74
91
78
85
74
83
70
75
60
70
54
60
43
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
86/ 100
Very good sunlight
Sunscore
There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
9.1 hrs
6.5 hrs
JuneDecember
Provided by Shadowmap
Redfin Estimate for 23 Robert Mills Cir
$3,645,204
$255K under list price of $3.90M
Nearby comparable homes
The Redfin Estimate uses 6 recent nearby sales, priced between $2.4M to $4.5M.