Lundin Leases Mesa Space for ONBASE Athlete Gym

Steve Lundin II has leased a 7,600-square-foot Mesa facility for a baseball-focused commercial gym set to open this winter.

Updated on Nov. 13, 2026 in Baseball

Empty indoor baseball training bay with a rubber pitching mound, batting cage netting, and soft daylight from a high window. — Steve Lundin II has leased a 7,600-square-foot Mesa facility for ONBASE Athlete, a baseball-focused commercial gym expected to open this winter. AI Illustration. Upload story photo >

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Steve Lundin II leased a 7,600-square-foot facility near Germann and Sossaman roads in Mesa for ONBASE Athlete, a commercial gym offering custom memberships. The gym is expected to open this winter.

Why it matters

The project adds a baseball-focused training facility to the East Valley, where demand for specialized athletic training is growing. Athletes will be able to purchase memberships tailored to their individual needs and budgets.

The 7,600-square-foot facility will include six hitting cages, two fielding areas, a pitching lane and a strength floor, according to the company's announcement. Membership pricing and the exact opening date were not specified.

The players

ONBASE Athlete

ONBASE Athlete is a commercial baseball training gym in Mesa, Arizona, offering custom memberships and specialized hitting, fielding, pitching and strength facilities.

Steve Lundin II

Steve Lundin II is a Marine Corps veteran who leased the Mesa facility for the ONBASE Athlete gym.

Brandon Schaeffer

Brandon Schaeffer is a co-founder of ONBASE Athlete and a former pitcher in the Seattle Mariners organization.

Yousef Zamat

Yousef Zamat is the head strength and conditioning coach for ONBASE Athlete and previously spent 14 years as a strength and conditioning coach for five Major League Baseball organizations.

The details

ONBASE Athlete will offer custom memberships tailored to each athlete's needs and budget, and a waitlist to purchase a membership is available on the company's website. Co-founder Brandon Schaeffer is a former pitcher in the Seattle Mariners organization, and the staff offers more than 20 years of professional coaching and playing experience.

October 2026: KNCT Athletics leased baseball training space in Tempe.
Winter 2026: ONBASE Athlete's Mesa gym is scheduled to open.

Market Landscape

The Mesa project follows a pattern of privately financed, membership-based baseball training facilities opening across the Valley, where KNCT Athletics leased its own Tempe training space in October. The facilities compete for athletes seeking specialized year-round instruction outside traditional school and club programs.

Athletes interested in ONBASE Athlete memberships can join the waitlist on the company's website before the gym opens this winter. Memberships are customized to each athlete's needs and budget, so prospective members can plan around their training goals.

The takeaway

Baseball players and families looking for specialized off-season training in the East Valley now have a new local option to consider. Joining the waitlist early may help secure a membership before the gym opens.