This year marks the 25th anniversary of KTGY Architecture + Planning.

The Orange County-based firm has seven offices around the world, including in LA, Oakland, Denver and Chicago.

To recognize its anniversary, KTGY embarked on a "25 Acts of Gratitude" campaign.

Employees in KTGY's Irvine office participated by coming together for a recent Habitat For Humanity Build Day (above). Staff at other KTGY offices also volunteered time to build homes for families in need.

KTGY's "Making a Difference Program" encourages staff members to apply for money to support charities of their choice.

Through this year's program, KTGY is helping feed the homeless this Thanksgiving, educate girls and build parks on vacant lots.

Some employees also volunteer with the ACE mentor program, which teaches high school students about careers in architecture, engineering and construction.

KTGY CEO Tricia Esser said the firm is grateful for its success and is looking forward to the future.