At Tributary Real Estate, we leverage our trusted relationships, depth of experience and robust real estate knowledge to provide a customized approach to commercial real estate brokerage and investment services in Denver. We believe that the best results come from building lasting, mutually beneficial relationships, and we work hard every day to cultivate those relationships with our clients and within the Denver community.

Our Core Values

Show Up

We are fully present and fully invested. We show up for each other, for our clients and for our community.

Advocacy Always

We are strategic advisors who remain focused on our client’s long-term success. We cultivate enduring relationships through our tireless advocacy and expertise.

Do the Right Thing

We go the extra mile in every interaction. Being successful doesn’t mean anything if it isn’t done with integrity.

Team Above Self

By working together toward a common vision and leaning into our individual strengths, we win together. Every hiring decision is made as a team to maintain our strong culture.

Give Back

We share our success by paying it forward and representing the Tributary values in our communities.

Meet the Team

Andy Cullen
Andy CullenPartner / Managing Broker
As partner and managing broker of Tributary Real Estate, Andy Cullen offers nearly two decades of experience in commercial real estate. Andy leads Tributary’s integrated brokerage and investment strategy, supporting the success of the team in delivering positive results for clients through a personalized service model.
Amy Aldridge
Amy AldridgePartner
As a partner at Tributary Real Estate, Amy Aldridge offers 15 years of experience in commercial real estate as a licensed broker. Amy drives the company’s continued growth through an integrated approach to brokerage and investment services. Amy’s extensive experience closing complex and challenging transactions has provided her with the expertise to find creative solutions for virtually any client real estate need – a skill she empowers her team to continually develop.
Jona Behm
Jona BehmSenior Broker
With more than eight years of commercial real estate experience in Denver, Jona Behm brings significant market knowledge and expertise to the Tributary Real Estate team. In her role as senior broker, Jona brings her talent for fostering relationships to assist clients in developing and executing real estate transaction strategies that ultimately position them for success.
Mark Floersch
Mark FloerschSenior Broker
Mark Floersch brings more than 16 years of office tenant representation experience to his role as a senior broker at Tributary Real Estate. His results-oriented approach and ability to deliver solutions that align with each client’s unique business goals and objectives have earned him the trust and loyalty of an extensive client base.
Natalie Froland
Natalie FrolandSenior Broker
Natalie Froland (formerly Natalie Geer) brings extensive business analytics and transaction management experience to the Tributary Real Estate team. In her role as a senior broker, Natalie primarily focuses on tenant and buyer representation, working to ensure clients are represented and supported through the entire transaction.
Michael Harpole
Michael HarpoleSenior Broker
With a background in project management and analytics, Mike Harpole brings a unique perspective to his role as an associate broker with Tributary Real Estate. A motivated self-starter with a strong aptitude for problem-solving, Mike believes in the power of strategic thinking and maintaining close client relationships to achieve success.
Nellie List
Nellie ListOperations Manager
As the operations manager for Tributary Real Estate, Nellie List oversees the daily operations of the company, implementing plans and processes to ensure the company’s goals and objectives are achieved. Nellie manages employee documentation, provides accounting and administrative support, drives culture initiatives, coordinates the team’s involvement in industry and professional organizations and directs marketing and public relations initiatives.
Bart Allen
Bart AllenBroker Associate
Bart Allen brings valuable business analytics and transaction management experience to his role as a broker associate with Tributary Real Estate. Driven by a passion for spurring growth on the local level, he leverages his strong market insight to create personalized solutions for clients and foster lasting relationships.