9th Street Development Company

What 9th Street Development Company does

9th Street Development Company (9SDC) is a privately held real estate development firm founded in 2019 and headquartered in Wilmington, Delaware. The company develops multi-family residential, mixed-use, historic renovation, and ground-up construction projects across three states (Delaware, Pennsylvania, and Texas), and is differentiated by its documented expertise in deploying Federal and State Historic Tax Credits and various public grant programs. Its active portfolio includes the 218,000+ sq ft Nylon Capital Center mixed-use redevelopment in Seaford, DE (under construction since 2Q24); The Walker Buildings adaptive-reuse project in Kennett Square, PA (176,000+ sq ft, 60 luxury apartments plus ~90,000 sq ft of retail/office/medical, underway 3Q26); The Battery (152 luxury units in Historic New Castle, DE, planned 2026); over 1,000 acres of shovel-ready industrial pad sites in South Dallas County, TX; and several smaller Wilmington infill projects combining 9-19 apartments with ground-floor retail or commercial space (West 9th Street, 801 Market Street, Tatnall West, 212 West 9th Street, 15 Girard Street).

The company generates revenue through a mix of property sales, long-term leasing of residential and commercial units, and developer economics across its held and stabilized assets. Tenant relationships are direct (residential leases, commercial/retail/medical tenancies, industrial land sales to end users), with listings distributed through the corporate website and platforms such as Apartments.com. Notably, 9SDC operates five wholly-owned subsidiary businesses (The Mill coworking at 100,000+ sq ft across Delaware locations, Girard Craft and Cork wine and spirits store, Faire Cafe, Blitzen Wilmington holiday pop-up, and The Post 1715) that are embedded within its real estate projects, providing destination economics, tenant demand support, and an internal small-business incubation platform aligned with the company's stated mission of supporting entrepreneurship.

The company is led by four co-founders who collectively managed over $1.1 billion in construction and real estate projects prior to 9SDC: Robert Herrera (former Perkins Eastman/S9 Architects, founder of The Mill), Stephen Weathers (former Senior Project Manager at BPGS Construction, managed over $175M of projects), Robert Snowberger (former Buccini/Pollin Group VP of Development, Wharton MBA, Navy SEAL veteran, managed over $200M of projects), and David Rinnier (former Head of Capital Markets at Buccini/Pollin Group and former J.P. Morgan analyst, executed over $750M in capital investments). Headcount is reported at 1-10 employees, indicating a developer-led model that relies heavily on founder execution rather than large organizational scale.

Name

9th Street Development Company

Legal name

9th Street Development Company

Website

https://9sdc.com

Company type

Private

Founded year

2019

Operating status

Operating

Headcount range

1–10 employees

Short description

9th Street Development Company is a privately held real estate developer founded in 2019 and headquartered in Wilmington, Delaware. It develops multi-family residential, mixed-use, historic renovation, and industrial projects across Delaware, Pennsylvania, and Texas, serving residential tenants, commercial occupants, and industrial end users.

Ownership category

akta.pro rank

Product category

Real Estate Development

NAICS

Commercial and Institutional Building Construction (23622), New Housing For-Sale Builders (236117), Construction of Buildings (236), Land Subdivision (2372)

SIC

Operative Builders (1531), General Bldg Contractors - Residential Bldgs (1520), General Bldg Contractors - Nonresidential Bldgs (1540), Land Subdividers & Developers (No Cemeteries) (6552)

akta.pro primary industry

Commercial General Contracting (New Build) (IMAFAAAA)

akta.pro secondary industry

Residential General Contracting (New Build) (IMAFAAAB)

Keywords

• Real estate development
• Multi-family housing
• Mixed-use projects
• Historic renovation development
• Adaptive reuse construction

Headquarters

HQ city

Wilmington

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Supply Chain, Operations, Personnel, Infrastructure, Others

Revenue model

1. Real Estate Development and Property Management: The company generates revenue through development and management of residential and commercial properties. This includes multi-family apartments, retail suites, mixed-use developments, and historic renovations. Revenue is derived from property sales, leasing of residential units, and commercial tenant rent.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

9th Street Development Company (9SDC) is a real estate development firm that acquires, develops, leases, and manages multi-family residential, mixed-use, historic renovation, and ground-up construction projects across Delaware, Pennsylvania, and Texas. The company also creates and operates supporting commercial business ventures (coworking, café, retail) within its developments to activate communities. Revenue is generated from property sales, residential apartment rentals, commercial/retail tenant rent, and industrial pad site sales.

Product overview

9th Street Development Company (9SDC) is a real estate development company offering a portfolio of residential and commercial projects across Delaware and Pennsylvania. The company's product portfolio consists of multiple real estate developments (including Nylon Capital Center, The Walker Buildings, The Battery, and various residential apartment/retail properties in Wilmington) and commercial business ventures (including The Mill coworking, Girard Craft and Cork, Faire Cafe, Blitzen Wilmington, and The Post). 9SDC specializes in multi-family, mixed-use, historic renovations, and ground-up construction, utilizing Federal and State Historic Tax Credits and various grant programs. Their unique development strategy supports and encourages new businesses and entrepreneurship.

Differentiator

Problem solved

Functional benefit

Products and services

• Nylon Capital Center 218,000+ sq. ft. mixed-use redevelopment in Seaford, DE, combining adaptive reuse and new construction to create a community town center with institutional, recreational, coworking, and EV-charging amenities.
• The Walker Buildings 176,000+ sq. ft. adaptive-reuse redevelopment in Kennett Square, PA, delivering 60 luxury apartments alongside roughly 25,000 sq. ft. of street-level retail and 65,000 sq. ft. of premium office and medical space.
• The Battery Luxury apartment community of 152 residential units overlooking the Delaware River in Historic New Castle, DE, planned to break ground in 2026.
• South Dallas Industrial Shovel-ready industrial pad sites in Wilmer, Hutchins, and Lancaster in South Dallas County, supported by over 1,000 acres of infrastructure and a referenced 291-acre retail distribution center project valued at $150+ million plus a 100-acre cold storage facility valued at $80 million.
• West 9th Street A 9SDC-developed mixed-use building of 16 residential apartments and 7 retail suites on the 200 block of W 9th Street in Wilmington, DE.
• 801 Market Street A 9SDC-developed mixed-use building of 16 residential apartments and 17,000 sq. ft. of commercial space on the 800 block of N Market Street in Wilmington, DE.
• Tatnall West A 9SDC-developed mixed-use building of 19 residential apartments and 3 retail suites on the 800 block of N Tatnall Street in Wilmington, DE.
• 212 West 9th Street A 9SDC-developed mixed-use building of 9 residential apartments and 4,000 sq. ft. of commercial space on the 200 block of W 9th Street in Wilmington, DE.
• 15 Girard Street A 9SDC-developed residential building of 12 apartments on the 800 block of N Tatnall Street in Wilmington, DE.
• The Mill Coworking A Delaware-based coworking and small-office space company wholly-owned by 9SDC, providing flexible workspace to startups, freelancers, and small businesses across multiple Delaware locations totaling over 100,000 sq. ft.
• Girard Craft and Cork A neighborhood wine and spirits store founded by 9SDC as part of its creative project development strategy to build community-level commercial experiences.
• Faire Cafe A cafe business founded by 9SDC as part of its commercial business venture portfolio operating within 9SDC-developed properties.
• Blitzen Wilmington A holiday pop-up bar business founded by 9SDC as part of its creative project development portfolio of seasonal commercial experiences.
• The Post 1715 A commercial business venture founded by 9SDC as part of its portfolio of community-activating commercial concepts.

Quantifiable outcome

• Over 1,000 acres of land developed with infrastructure in South Dallas County
• +1 more outcomes

Segments3 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Four partnerships are on record, tiered core and minor.

• Delaware Prosperity PartnershipcoreStrategic or Co-development Partner9SDC founder Robert Herrera is a sitting member of the Delaware Prosperity Partnership Board of Directors. The company works with this economic development organization on projects like the Nylon Capital Center redevelopment in Seaford, which was identified as a potential catalyst for entrepreneurship and economic resurgence.
• The MillcoreStrategic or Co-development Partner9SDC co-founder Robert Herrera founded and remains managing partner of The Mill, a coworking company that has grown to over 100,000 square feet. The Mill opened its third Delaware location in Seaford at the Nylon Capital Center in July 2026.
• City of SeafordcoreStrategic or Co-development PartnerThe City of Seaford spent decades attempting to revive the former Nylon Capital Shopping Center property before Mill founder Rob Herrera and 9th Street Development took on the project in 2022. The partnership involves redevelopment of the 1950s shopping center that was once the hub of a DuPont company town.
• South Dallas Local DevelopersminorStrategic or Co-development Partner9SDC partnered with local developers to deliver shovel-ready industrial pad sites in the cities of Wilmer, Hutchins and Lancaster in South Dallas County. Collectively, they have driven infrastructure to over 1,000 acres of land.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Buccini/Pollin Group: The largest Wilmington-based real estate developer where 9SDC co-founders Snowberger and Rinnier previously served. BPG operates in multi-family, mixed-use, and commercial development across the Mid-Atlantic and is the most directly comparable peer in the same geography.
• Harvey, Hanna & Associates: A Delaware-based commercial real estate developer and investor with a similar mixed-use, multi-family, and adaptive-reuse focus in the Mid-Atlantic. They compete directly with 9SDC for the same urban revitalization opportunities in Delaware.
• Continental Real Estate: Mid-Atlantic real estate developer with mixed-use, multi-family, and historic renovation projects. Comparable to 9SDC in project type and scale, with similar urban revitalization focus in cities like Wilmington and Philadelphia.

Others

• The Mill (peer in coworking space): Listed as a separate entity but is actually 9SDC's coworking subsidiary. Included as a competitor reference for the coworking/workspace business line that 9SDC operates alongside property development.

Regional players

• Wohlsen Construction Company: Mid-Atlantic construction and development firm with historic renovation and mixed-use projects in Pennsylvania and Delaware. Comparable in scale and project type, particularly relevant to 9SDC's Kennett Square and Wilmington portfolio.
• Stream Realty Partners: National commercial real estate firm with significant industrial and office development in Texas markets. Comparable to 9SDC's South Dallas Industrial project, though Stream operates at a larger scale.

Broad incumbents

• Brandywine Realty Trust: Philadelphia-based publicly traded real estate investment trust focused on Class A office, mixed-use, and residential development in the Mid-Atlantic. Comparable to 9SDC's commercial and mixed-use projects, particularly the Walker Buildings.
• Liberty Property Trust (now Prologis): Was a major industrial real estate developer in the Mid-Atlantic and Texas markets before being acquired by Prologis. Directly comparable to 9SDC's South Dallas Industrial land development project for distribution and logistics users.
• JLL (Jones Lang LaSalle) Residential Development: Global real estate services firm with active multi-family and mixed-use development advisory and investment. Comparable to 9SDC in residential and mixed-use development, though at a much larger institutional scale.
• Greystar Real Estate Partners: The largest multi-family developer and operator in the U.S. While vastly larger in scale, Greystar overlaps with 9SDC in multi-family residential development and operating investment strategy.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/Ninthstdevco
• Facebookfacebook.com/Ninthstdevco
• LinkedInlinkedin.com/company/9sdc

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 9th Street Development Company