"The stairs in the icon are The War Memorial building steps that lead to SFMOMA. Wayne Thiebaud's "Display Cakes" (oil on canvas, 1963) is in SFMOMA's collection. I know this because one of my students is writing a paper on Thiebaud's paintings of desserts.
You might like to know that a few weeks ago, that student lost his keys at the museum. They showed up in the museum's lost and found. Among many other keys, he says he saw a gold key, that from his description, might be the key you seek.
It is a sunny day, and I'm drinking Rainier Ale."