About Us

Meet the Team

Jonathan Deason, Esq.

Jonathan’s background as a tax and real estate attorney and 20-year bay area resident enables him to provide exceptional service to his clients. Jonathan transitioned from the practice of law into real estate in 2007 and has been a Top Producer at Vanguard Properties ever since—selling over $400,000,000 of real estate since then. Jonathan’s legal expertise makes him comfortable with all aspects of contract negotiations, drafting and interpretation. Extremely personable, dedicated and service-oriented, Jonathan is well known for his 24/7 accessibility, his legendary discretion, laser-focus, and attention to detail.

Jonathan’s extensive career has focused on both traditional real estate sales as well as new construction sales throughout the city’s most popular neighborhoods—including Noe Valley, Mission Dolores, Castro, Mission, SOMA, NOPA, Hayes Valley, Pacific Heights, Russian Hill, and Presidio Heights.

In addition to single-family home and condominium resales, Jonathan has extensive experience in the listing and sales of new construction condominium buildings and TIC-conversion projects-having sold over 100 of these units in recent years. Jonathan’s legal background enables him to work closely and manage the legal paperwork with Title Company’s Subdivision departments, the City and County of San Francisco, condominium and land use attorneys, budget preparers & DRE deputies to assist in the issuance of the final documentation (Public Report) required to sell new and converted developments.

Jonathan was born and raised in Santa Monica, California and earned a Bachelor’s of Arts degree from U.C. Berkeley in Art History before going on to earn his Juris Doctorate at U.C. Hastings College of the Law, where he served on the Law Review. Jonathan is a homeowner in San Francisco’s Corona Heights district and is active in the San Francisco nonprofit community. Jonathan also holds a Commercial Pilot Certificate (with multi-engine and instrument ratings) and is an active owner/pilot of a Cirrus SR22T.

Alan Martinez

After buying and selling multiple properties in San Francisco, in 2017 Alan joined Vanguard Properties with the encouragement of his longtime friend and fellow team member, Jonathan Deason. By leveraging Jonathan’s extensive sales experience in selling traditional real estate, new construction and development sales, and Alan’s client-centric approach to customer service, they deliver an unparalleled level of service in the industry. Since joining forces, they have facilitated over $100,000,000 in real estate transactions. They are proud of their business built on referrals, high-quality service, and trust—resulting in relationships that frequently last into multiple transactions!

Prior to selling real estate, Alan led, coached, and inspired a team of over 30 salespeople at a successful Bay Area automotive dealership. A leader, who leads through high involvement, Alan is still highly regarded by his peers in the industry and continues to share tips and tricks of the trade with them.

A native of the Bay Area, Alan has called San Francisco his home since 2011. Since growing up as a young boy, Alan has always felt enamored with the unique freedom to be you that San Francisco champions. In his time in the city, he’s lived in six different neighborhoods and currently resides at One Rincon Hill in South Beach. A self-proclaimed extroverted extrovert, Alan can usually be found entertaining friends at his condominium or sharing a pitcher of margaritas by the building pool. Alan’s diverse residential experience and intense love for San Francisco help him to educate his clients about the vibrant culture of each unique SF neighborhood and assist them in choosing the perfect new home!

Ask anyone, and they will tell you Alan is available 24/7 to respond to his client’s questions and concerns, whether it be in the heat of negotiations, or simply to provide a contractor referral — he’s there! Alan’s number one priority has always been giving his clients the personal attention they deserve, always making them feel like the only person in the room. Whether you are buying a home or selling your current one, Alan’s meticulous attention to detail and strong negotiation skills will ensure that every aspect of your transaction goes smoothly, empowering you to make a sound decision.

Nicholas Spangler

As a Marin County native, with a deep love of San Francisco, Nicholas Spangler’s top priority is helping our clients achieve their real estate goals in this incredible city. Nick is known for offering concierge-level service with great attention to detail while never losing sight of the client’s end goal. In his real estate practice, Nick collaborates with a diverse and experienced community of other real estate agents, contractors, and specialists in order to provide his clients a full-service white-glove experience. Nick attributes his success to what he believes to be his strong points: a patient, no pressure approach; deep quantitative analysis skills; and always putting our clients first.

Known for his positive, engaging attitude, Nicholas’ professional background in service, sales and business informs his astute, client-centric approach. Whomever the client, he always takes the time to listen closely and give them careful, customized advice. He understands that real estate is often the biggest investment a person will make in their lifetime, and he truly cares about helping his clients make smart, informed decisions. Clients consistently appreciate Nick’s positive demeanor, discretion, and strategic guidance as they navigate the entire sales, purchase or investment process, step by step.

Prior to joining The Deason Group, Nicholas served as the head of Vanguard Properties’ Analytics Department, with 9 years of market research expertise under his belt. Accomplished in a wide array of qualitative and quantitative research practices and methodologies, Nicholas’ extensive background in market research provides our clients actionable insights through straightforward understanding and articulation of the current market.

In his downtime, Nicholas passionately loves optimizing his nutrition and health in service of his other true love (outside of real estate!) weight training. In addition, he is an avid reader and especially enjoys history, psychology and philosophy. In his travels, he loves exploring new cultures and histories and is particularly fond of traveling throughout Asia.


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The Deason Group would like to thank all our clients and colleagues for helping us achieve 2022 Real Trends America’s Best | Teams by Volume. We have ranked in the Top 1% of all teams NATIONWIDE! We could not have achieved this without YOUR support!