History
KC MASS Services is a construction, development, and advisory firm operating at the intersection of the built environment and real estate. Founded in 2003, the company has evolved from traditional general contracting and brokerage services into a specialized platform delivering strategic solutions across residential, commercial, and mixed-use projects.
With deep expertise in construction execution, real estate advisory, and project leadership, KC MASS provides a fully integrated approach—guiding projects from concept through completion. The firm supports developers, property owners, institutions, and stakeholders with services that include ground-up construction, adaptive reuse, universal design implementation, and owner’s representation.
A defining component of KC MASS’s work is acting as an owner’s representative, protecting client interests throughout the entire lifecycle of a project. In this role, the firm provides oversight, coordination, and strategic guidance across design, budgeting, scheduling, and construction execution, ensuring alignment between vision, cost, and delivery.
A key area of focus for KC MASS is adaptive reuse, transforming underutilized or obsolete structures into high-performing, purpose-driven assets. The firm brings a practical lens to repositioning existing buildings, aligning design, code compliance, and construction strategy to unlock value while extending the asset's lifecycle.
KC MASS is led by a commitment to practical execution, regulatory alignment, and forward-thinking design—particularly in accessibility, aging-in-place, and barrier-free environments. The company’s work reflects a broader mission: improving how people live, recover, and function within the spaces they occupy.
Get in touch
KC MASS Services provides integrated construction, real estate, and owner representation services to help clients move projects forward with clarity and confidence. Whether you are evaluating a concept, repositioning an asset, or preparing for development, we offer experienced guidance grounded in real-world execution.
We believe that providing both services from a single entity can be a value-added, efficient delivery system that benefits you. That's why we offer an initial free phone consultation to discuss your needs, the scope of your goals, and your budget.
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Leadership Expertise
Partner
Mark Irvin
As Co-Founder and CEO of KC MASS Services, Mark Irvin brings more than three decades of experience across construction, real estate, and development strategy. As a licensed Class A General Contractor and Missouri Real Estate Broker, he has led projects ranging from residential redevelopment to complex construction, adaptive reuse, and owner representation engagements.
Mark is also a paraplegic, and that perspective is central to his leadership and the work KC MASS delivers. His lived experience provides insight into accessibility, usability, and real-world functionality that cannot be replicated through standards alone. He understands firsthand how design decisions impact independence, safety, and quality of life.
He provides consulting services that include feasibility analysis, scope development, and valuation insight across residential and mixed-use projects. His ability to operate at both the construction and ownership level has made him a trusted advisor—helping clients navigate development decisions, mitigate risk, and maintain control of their projects from concept through completion.
Mark’s work in accessibility and universal design has positioned him as a forward-thinking voice in the industry. Today, his focus extends into adaptive reuse, owner representation, and development strategies that better align real estate with real-world human needs.
Education
International Building Code (IBC) Class A General Contractor certification
Urban Land Institute – REDi (certificate program)
Licensed Realtor (Broker), State of Missouri
International Codes Council - ongoing
Penn Valley Community college
Augmenting the built environment
Partner
Sharon Irvin
Dedicated and knowledgeable professional, Sharon Irvin serves as co-founder and director of business development at KC MASS Services. With more than 20 years of experience, Sharon has spent time on the realty side and the financial side of real estate and knows the ins-and-outs of owning, buying, renovating and constructing single- and multi-family properties.
Sharon began her career as a real estate agent in the St. Louis area, showcasing impressive numbers early on, including 42 transactions that totaled $6.7 million in annual sales volume and a close rate of 99%, far exceeding industry averages. She continued her real estate domination for several years, eventually selling homes in Overland Park, Kansas, and surrounding areas.
While working on the real estate side, Sharon also began working for one of the oldest and largest family-owned U.S. mortgage lending firms as a senior operator, helping customers with loans and assisting in the development of IT and marketing initiatives. Since 2017, she has been a loan specialist for a federal government agency, furthering her knowledge of the real estate and construction industry.
Since 2003, Sharon has been a significant part of the development of the KC MASS organization. With her expertise, her management skills, and her business development acumen, Sharon continues to help KC MASS customers on a daily basis navigate their projects and keep them up to date on all the latest construction processes.
Education
Urban Land Institute – REDi (certificate program)
Licensed Realtor, State of Missouri
Clark Atlanta University
Florissant Valley College