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County Seat Professional Complex Riverhead, NY 11901 1,000 - 10,395 SF of Space Available

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PARK FACTS

Total Space Available 10,395 SF
Park Type Office Park

ALL AVAILABLE SPACES(6)

Display Rental Rate as

County Seat Professional Complex
1149 Old Country Rd - Bldg A
2,000 - 5,995 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
10,000 SF
Building Height
1 Story
Typical Floor Size
10,000 SF
Parking
40 Spaces
  • SPACE
  • SIZE
  • TERM
  • RENTAL RATE
  • SPACE USE
  • CONDITION
  • AVAILABLE
  • 1st Floor, Ste Unit A1
  • 3,995 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Medical
  • Full Build-Out
  • Now
  • Fully Built-Out as Standard Medical Space
  • Space is in Excellent Condition
  • Office intensive layout
  • 1st Floor, Ste Unit A2
  • 2,000 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Office/Medical
  • -
  • Now
Space Size Term Rental Rate Space Use Condition Available
1st Floor, Ste Unit A1 3,995 SF Negotiable Upon Request Upon Request Upon Request Upon Request Medical Full Build-Out Now
1st Floor, Ste Unit A2 2,000 SF Negotiable Upon Request Upon Request Upon Request Upon Request Office/Medical - Now
County Seat Professional Complex
1149 Old Country Rd - Bldg A
2,000 - 5,995 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
10,000 SF
Building Height
1 Story
Typical Floor Size
10,000 SF
Parking
40 Spaces

1149 Old Country Rd - 1st Floor - Ste Unit A1

Size
3,995 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Medical
Condition
Full Build-Out
Available
Now

1149 Old Country Rd - 1st Floor - Ste Unit A2

Size
2,000 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Office/Medical
Condition
-
Available
Now
County Seat Professional Complex
1149 Old Country Rd - Bldg B
1,200 - 2,400 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
4,000 SF
Building Height
1 Story
Typical Floor Size
4,000 SF
Parking
168 Spaces
  • SPACE
  • SIZE
  • TERM
  • RENTAL RATE
  • SPACE USE
  • CONDITION
  • AVAILABLE
  • 1st Floor, Ste Unit B2
  • 1,200 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Office/Medical
  • Shell Space
  • Now
  • 1st Floor, Ste Unit B4
  • 1,200 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Office/Medical
  • Shell Space
  • Now
Space Size Term Rental Rate Space Use Condition Available
1st Floor, Ste Unit B2 1,200 SF Negotiable Upon Request Upon Request Upon Request Upon Request Office/Medical Shell Space Now
1st Floor, Ste Unit B4 1,200 SF Negotiable Upon Request Upon Request Upon Request Upon Request Office/Medical Shell Space Now
County Seat Professional Complex
1149 Old Country Rd - Bldg B
1,200 - 2,400 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
4,000 SF
Building Height
1 Story
Typical Floor Size
4,000 SF
Parking
168 Spaces

1149 Old Country Rd - 1st Floor - Ste Unit B2

Size
1,200 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Office/Medical
Condition
Shell Space
Available
Now

1149 Old Country Rd - 1st Floor - Ste Unit B4

Size
1,200 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Office/Medical
Condition
Shell Space
Available
Now
County Seat Professional Complex
1149 Old Country Rd - Bldg C
1,000 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
6,000 SF
Building Height
1 Story
Typical Floor Size
6,000 SF
Parking
45 Spaces
  • SPACE
  • SIZE
  • TERM
  • RENTAL RATE
  • SPACE USE
  • CONDITION
  • AVAILABLE
  • 1st Floor, Ste Unit C1
  • 1,000 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Office/Medical
  • -
  • Now
Space Size Term Rental Rate Space Use Condition Available
1st Floor, Ste Unit C1 1,000 SF Negotiable Upon Request Upon Request Upon Request Upon Request Office/Medical - Now
County Seat Professional Complex
1149 Old Country Rd - Bldg C
1,000 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1984
Building Size
6,000 SF
Building Height
1 Story
Typical Floor Size
6,000 SF
Parking
45 Spaces

1149 Old Country Rd - 1st Floor - Ste Unit C1

Size
1,000 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Office/Medical
Condition
-
Available
Now
County Seat Professional Complex
1149 Old Country Rd - Bldg E
1,000 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1987
Building Size
3,000 SF
Building Height
1 Story
Typical Floor Size
3,000 SF
Parking
45 Spaces
  • SPACE
  • SIZE
  • TERM
  • RENTAL RATE
  • SPACE USE
  • CONDITION
  • AVAILABLE
  • 1st Floor, Ste Unit E2
  • 1,000 SF
  • Negotiable
  • Upon Request Upon Request Upon Request Upon Request
  • Office/Medical
  • -
  • Now
Space Size Term Rental Rate Space Use Condition Available
1st Floor, Ste Unit E2 1,000 SF Negotiable Upon Request Upon Request Upon Request Upon Request Office/Medical - Now
County Seat Professional Complex
1149 Old Country Rd - Bldg E
1,000 SF | Upon Request Upon Request Upon Request Upon Request Upon Request Upon Request | View Building Details
Building Type/Class
Office/B
Year Built
1987
Building Size
3,000 SF
Building Height
1 Story
Typical Floor Size
3,000 SF
Parking
45 Spaces

1149 Old Country Rd - 1st Floor - Ste Unit E2

Size
1,000 SF
Term
Negotiable
Rental Rate
Upon Request Upon Request Upon Request Upon Request
Space Use
Office/Medical
Condition
-
Available
Now

1149 Old Country Rd - 1st Floor - Ste Unit A1

Size 3,995 SF
Term Negotiable
Rental Rate Upon Request
Space Use Medical
Condition Full Build-Out
Available Now

  • Fully Built-Out as Standard Medical Space
  • Office intensive layout
  • Space is in Excellent Condition

1149 Old Country Rd - 1st Floor - Ste Unit A2

Size 2,000 SF
Term Negotiable
Rental Rate Upon Request
Space Use Office/Medical
Condition -
Available Now

1149 Old Country Rd - 1st Floor - Ste Unit B2

Size 1,200 SF
Term Negotiable
Rental Rate Upon Request
Space Use Office/Medical
Condition Shell Space
Available Now

1149 Old Country Rd - 1st Floor - Ste Unit B4

Size 1,200 SF
Term Negotiable
Rental Rate Upon Request
Space Use Office/Medical
Condition Shell Space
Available Now

1149 Old Country Rd - 1st Floor - Ste Unit C1

Size 1,000 SF
Term Negotiable
Rental Rate Upon Request
Space Use Office/Medical
Condition -
Available Now

1149 Old Country Rd - 1st Floor - Ste Unit E2

Size 1,000 SF
Term Negotiable
Rental Rate Upon Request
Space Use Office/Medical
Condition -
Available Now

SELECT TENANTS AT THIS PROPERTY

  • FLOOR
  • TENANT NAME
  • INDUSTRY
  • 1st
  • Optum
  • Health Care and Social Assistance

PARK OVERVIEW

Located at 1149 Old Country Road in Riverhead, NY 11901, this professional office complex features 22 private suites set on nearly four acres of meticulously maintained grounds. Strategically positioned, the property offers convenient access to key amenities and services, making it an ideal location for both medical and professional use in the Riverhead area.

  • Listing ID: 35843788

  • Date on Market: 2025-12-02

  • Last Updated:

  • Address: 1149 Old Country Rd, Riverhead, NY 11901

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