1861 Wackenreuder Map of San Francisco, showing <a href="https://en.wikipedia.org/wiki/Pioneer_Race_Course" class="extiw" title="w:Pioneer Race Course">Pioneer Race Course</a> in the Mission District. Complete map is available in the <a rel="nofollow" class="external text" href="http://www.davidrumsey.com/maps6094.html">David Rumsey Map Collection</a><br>Vitus Wackenreuder was a Swiss German surveyor with offices in San Francisco and San Mateo. This detail of his 1861 map shows the Pioneer Race Track north of <a href="https://en.wikipedia.org/wiki/Precita_Creek" class="extiw" title="w:Precita Creek">Precita Creek</a> with some streets.
Vitus Wackenreuder
San Francisco Surveyor Map, 1861