San Francisco architecture has a lot of small, darling details – those victorians with painted ladies that line roofs, beautiful trim detailing, fine proportions and, of course, bay windows.
In a victorian, trying to overcome the darkness a floor plan has created can be a daunting task. Since a San Francisco lot is typically 25×100, adding light at both ends creates length but also keeps the center of a home appropriately darker. Bay windows are a simple solution to the problem of light in a typical San Francisco home. You can use them to extend over, into a sidewalk, or outwards over your yard. This makes them into friendly, free-real estate which developers tend to find appealing. Plus, sometimes it will grant you a new view of the water!