Material of which something is made
and from which it derives its special qualities.

From ground-up construction to commercial tenant improvements, Substrata is driven by precision-based craftsmanship. Our attention to detail aims to transcend the industry status quo, providing confidence that every piece of your vision has been precisely accounted for.

Our Difference


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Chief Executive Officer
LEED AP General Contractor

Cecille is Substrata’s LEED-certified prime contractor and chief executive leading the spectrum of construction operations. With over a decade of experience in construction project management and general contracting, she has developed a methodical and transparent approach in providing quick, efficient, and quality results for her clients. By partnering with our skilled craftsmen and preferred suppliers, Cecille has an unrelenting commitment to our clients by maximizing both their investment assets and personal property to its highest-and-best use.

Her previous track record as the lead project manager for Tenant Improvement Specialists resulted in the successful adaptive reuse of the UCLA Childcare Center in Westwood Village, as well as numerous retail improvements within the famed Via Rodeo corridor on Rodeo Drive. Before her position at Substrata, Cecille was allowed to expand her focus as the Director of Construction at Concord Real Estate, where she spearheaded an array of luxury residential and multifamily projects.

While building sustainable communities energizes Cecille, she is equally committed to enriching the livelihoods of less fortunate people residing within them. Cecille is an active participant in World Vision International, where she has sponsored more than six underserved children from countries such as Laos and Sri Lanka.

LEED AP | U.S. Green Building Council
General Contractor | CA Contractors State License Board

Majid Riahi

Chief Strategy Officer
Managing Partner

Majid oversees key elements of Substrata’s internal operations, wider corporate strategies, and is the creative architect for the company’s unique brand identity. His tenacity for innovation and defying conventional wisdom piqued during a college apprenticeship working alongside Hungarian business strategist George Gabor Burt, who was one of the core, original experts of the Blue Ocean Strategy innovation model.

Before dedicating his time to Substrata, Majid was responsible for negotiating triple-net property acquisitions and structuring retail leases at Concord Real Estate, a commercial investment firm in Beverly Hills. Majid’s 12-year track record as both a Principal and associate in the commercial real estate community gives him a keen understanding on the needs and idiosyncrasies of Substrata’s diverse clientele.

Majid is an alumnus of the University of Central Florida where he earned his B.S.B.A. with a focus on Entrepreneurship. He gained further credentials in International Trade & Commerce from the University of California, Los Angeles.

President & Accredited Investor | Avant Equity
Licensed Member | California Department of Real Estate

We are driven by our CITIES ethos.

We are driven by our CITIES ethos.

We want to be part of something bigger than ourselves.

Our neighborhood-centric approach comes from the desire to make transformative changes to the economic and livability standards of our communities. After all, we operate in our own backyards as much as we do yours.

We proudly challenge conventional wisdom in order to discover unique, fit-for-purpose solutions for our clients. Our use of the newest construction software technology provides unparalleled efficiency when engaging with clients and field management.

We respect different perspectives, share knowledge through collaborative thinking, and approach everyone with dignity for the purpose of continuous growth—individually and collectively. We subscribe to the principle of kaizen, which in its basic Japanese form represents “constant improvement for the better.”

We conduct our business affairs with the highest ethical standards, and our moral character is non-negotiable. No persuasiveness is more effective than the transparency we offer our clients and partners.

We are known for precision-based craftsmanship at powerful value. We believe achieving excellence requires the seamless alignment of quality, value, client experience, and time. We are hyper-focused on maximizing our client’s property by investing in the materials, skilled specialists and time to achieve an excellent outcome.

We have an uncompromising focus on safeguarding the health and safety of our associates, clients, and the general public at all times. We counter the elevated risks in our industry by emphasizing proper training and equipping our tradesmen with modern safety equipment.