John Mosby

John Mosby is a co-founder and partner (managing member) of M3 Multifamily, LLC, a Santa Barbara, California–based private real estate investment firm he launched in 2008 with partner Jon Martin. Within the firm, Mosby leads property acquisition, asset management, and day-to-day operational oversight of the portfolio. He has worked in the multifamily housing industry since 1989.

Before co-founding M3, Mosby spent 11 years as a Vice President at NALS, where he was responsible for asset management of more than 6,000 apartment units across Arizona, New Mexico, Texas, Georgia, and North Carolina. Over the course of his career he has overseen the management of more than forty multifamily communities in twelve cities, developing deep experience in acquisitions, due diligence, physical inspections, staff management, regulatory administration, asset repositioning, and renovation.

Mosby holds a Bachelor of Arts in Economics from the University of California, Irvine. Alongside partners Jon Martin (co-founder), Michael Bracy (partner), and Patrick Macalik (VP of Operations), he has grown M3 into a vertically integrated owner-operator. According to the firm, M3 has raised roughly $250 million of investor equity and placed about $330 million of debt across a portfolio of 19 multifamily communities totaling more than 3,735 units, of which roughly 12 properties are currently held and operated.

• Acquires, repositions, develops, and manages multifamily assets as a tax-efficient, long-term hold strategy — the firm describes itself as "disciplined, patient stewards of capital" prioritizing steady, diversified returns and growing net cash flow over short-term gains.
• Conservative underwriting: uses conservative valuations (avoiding best-case scenarios), modest leverage (under ~65%) with adequate capital reserves, and ongoing capital reinvestment.
• Target deal profile: minimum ~$5 million equity per transaction; properties of 125+ units, built in the 1980s or newer, with value-add or repositioning potential; in-house asset management to manage efficiently at scale.
• Tax efficiency for investors: employs cost-segregation studies and tax-deferred strategies; structures diversified funds for multi-property exposure and states that investor returns are prioritized over manager compensation.
• Market selection: favors high-growth Sun Belt markets that are "attractive places to live" and that the firm can operate efficiently at scale (Austin/Round Rock, Nashville, Tucson, Phoenix, San Antonio, Reno); has shown particular interest in ground-up and Opportunity Zone development.