"These tree grates are part of Phase One of the Valencia Streetscape Improvement Project. They were designed by DPW architects John Dennis and Martha Ketterer and manufactured by Iron Age Grates company." [artandarchitecture-sf.com]
""People wanted something funky, something that represents the Mission, something that's not too suburban," said John Dennis, a landscape architect with the Department of Public Works." [SF Chronicle]
There are more pictures of the grates on the website of the Iron Age Grates Company that manufactured them.
Wow tree grates - learn more about other tree grates in the city.