I worked at a company in that same office building for over either years, so this was my regular go-to place almost everyday for lunch and sometimes breakfast.
There are a group of office buildings in this plaza, and most of them have a sort of a cafeteria or a restaurant at the ground floor. My favourite was always the Mission Eatery.
It's a small little place, maybe 30 seats or so, but it's meant for a quick lunch break bite or so. Ownership of this place changed quite few times throughout the years, and current owner did it the best in my opinion. They revamped the menu and tweaked their best items to make them even better.
They have a website that they update every single day with the day's soup and hot main items which change everyday to give you that variety and break the routine of a fixed menu.
My star plate at this place is the Cobb salad with grilled chicken, it's probably the best cobb salad i've hd anywhere! And their Italian wedding soup (when it is available) is unreal!