Architecture Walking Tour in SF

Last weekend was pretty hot in all over Bay Area. However, San Francisco was perfectly beautiful. We did "Architecture Walking Tour"(http://www.architecturesf.com/). It was very informative and impressive. He(Rick) not only explained about historical buildings and backgrounds, but also the plan for the future development in the city and POPOS (Privately Owned Public Open Spaces). It's all new to me and makes me want to appreciate SF more.

Here is the background of POPOS:
While parks are the obvious public spaces, POPOS are often more hidden courtyards, roof-top gardens, and plazas open to city-dwellers. POPOS are an integral part of San Francisco’s downtown plan that allowed for high-density private development while allotting some spaces for public use. While these spaces are legally open to the public during certain hours of the day, many are unknown or uninviting as public spaces.

This is the map for POPOS.
www.architecturesf.com/blog

If you would like to do something different in the city, I think you will like this!