Expertise | what we do

Our value begins long before breaking ground, and endures long after project delivery.

Full Service Solutions

The success of a project is often determined by the decisions made during the early stages of a project when the idea is no more than a napkin sketch. The SLL team unites the early stages of entitlement, design and construction to provide our clients with an integrated approach and measurable value. As a trusted partner, we help our clients “fill in the blanks” to bring their napkin sketches to life with full service solutions, helping to assemble the appropriate design and consulting team.

Owner Representation

Construction Project Management

Diverse Experience

SLL is an award-winning, turnkey, owner representation and project management company performing a wide range of services—from full base building ground up construction and renovation to shell construction. Our client-focused teams are organized into expert market sectors to support all project management needs.

Our quality does not waver. It doesn’t matter how big or small, fast or long a project is, our expectation of quality remains constant.

Sean Leonard

Our Markets | Where We Are


From K-12 education facilities to state-of-the-art research campuses and student housing, SLL has the expertise to manage the design, entitlement and construction of a wide spectrum of learning environments.


We manage projects that entertain, excite, and inspire. At SLL, our team takes pride in delivering facilities that are a significant asset to the communities they serve.

Multi-Family Housing

A leader in multifamily, senior, memory care, and affordable housing project management, S.L. Leonard has delivered over 7,500 residential units including apartments repositioned from historical buildings to new construction high-rise condominiums and occupied renovations.


Our healthcare sector consists of proven experts in owner representation and project management for every type of healthcare project, including hospitals and outpatient facilities, laboratories and specialist facilities.


From new construction to fit-outs, we can manage the construction of a variety of industrial commercial properties including distribution centers, maintenance facilities, cargo, flex/warehouse, manufacturing, biotech, and R&D facilities.


SLL provides turnkey construction services for municipal, federal and foreign governments. We understand the complexities of public sector projects and excel within all agency requirements.


Details matter. From intricate finishes to large commercial build outs, SLL has earned a reputation for delivering award-winning office spaces built to suit our clients’ unique needs.


From city centers to colossal shopping complexes, we partner with our clients to deliver well-planned, award-winning spaces that make it more convenient and enjoyable for community members to live, work, shop, and play.

Tenant Improvements

SLL is one of the leading tenant improvement management firms. We deliver a wide range of projects from a single new office build-out to national accounts for some of the most recognizable retail companies.

What They Say

As we began construction, S.L. Leonard & Associates came on board for management and oversight of an existing team. They stepped in without a hitch. The transition was smooth and everyone is delighted with their consistent leadership and sound organization. Communication has been excellent. Sean translates ‘development-speak’ into real language so we know the status and the conditions of progress. Our Board is very pleased with how the project is proceeding.
Robert K. Ross, M.D., CEO, The California Endowment

S.L. Leonard & Associates is highly regarded as straightforward, honest, trustworthy and fair. Sean and his team look at every possible angle to determine the most effective and efficient way to shepherd the project through to completion.

Kevin Kildee, City Council Member and Former Mayor, City of Camarillo
I want to start by saying that I could not have handled this project without the help and guidance of Sean’s team. Their professionalism is exemplary. Each member of the team, Sean, Pia and Dennis had their own “specialty” during the course of the project and all of them had a wonderful calming demeanor that made it a pleasure to work with. They kept the project progressing by not only maintaining detailed records of the myriad issues and decisions but by communicating consistently and often with the entire team. A project like this has so many moving parts and so many players that their roll was pivotal in maintaining the project timeline. The paperwork was overwhelming yet they kept detailed records throughout and tracked the various expenditures always analyzing them to protect our interests. We found them to be exceedingly fair and diplomatic in handling any conflicts or misunderstandings. Their in-depth knowledge of both construction processes and methods was not only very educational to our team, it was reassuring to us as clients navigating new territory.
Kim Bernard, Executive Director Facilities Design, Walker + Zanger