About Us

Cornerstone Architectural Group, LLC is a service-driven and client-focused architectural design firm located in South Plainfield, New Jersey. Since its founding, the firm has provided creative, practical, and cost-effective solutions across a wide range of project types. With expertise spanning municipal, commercial, industrial, and institutional projects, Cornerstone delivers designs that balance functionality, compliance, sustainability, and aesthetics.

Our philosophy is simple: every project deserves thoughtful attention, technical rigor, and a commitment to creating environments that serve people, organizations, and communities for the long term.

Leadership

The firm is led by Robert M. Longo, AIA, LEED AP, a licensed architect with more than 30 years of experience. As principal, Robert combines his deep knowledge of building codes, construction practices, and sustainable design with a collaborative, client-focused approach. He is recognized throughout the region for his expertise in life-safety compliance, hazardous materials classification, accessibility standards, and property condition assessments.

Robert is also an educator and mentor, sharing his expertise through teaching architecture and interior design courses at Brookdale Community College, and through active participation in professional organizations such as AIA-New Jersey and Sustainable Jersey.

Services

Cornerstone offers a comprehensive range of architectural services, including:

Architectural Design: Planning and design for new construction, renovations, and adaptive reuse.

Code Consulting: Specialized expertise in International Building Code (IBC), NFPA standards, ADA accessibility, and NJ subcodes.

Feasibility Studies & Property Condition Assessments: Helping owners, developers, and investors understand existing building conditions and opportunities.

Project Management: Coordination from concept through completion.

Cornerstone Architectural Group

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