This book shows the layout of San Francisco's streets in 1894 and shows who owns each individual property, by writing the owner's name into the appropriate subsection of the map of each block in the city.

It is complete and shows all neighborhoods in one volume (unlike the 1909/10 edition which has different neighborhoods broken out into different volumes). It is particularly valuable because the city itself lost many of its property records in the fire. The official records may not show you the original developer or owner of your property - but this book will show you who owned it in 1894, and later editions such as the 1906 edition (also available in Open Library) will show you who owned it after that.