I just came across this as well.
Is this an early vestige of the Southwest Museum? (museum is written on the card)
cardboard photograph/1890s
http://www.ebay.com/itm/1890s-Cardbo...item2ec8559fac
As most of you know, Garvanza was located immediately north of downtown in the area we know today as Highland Park.
The town was annexed by the City of Los Angeles in 1899.
The card also mentions Sycamore Grove. I don't know where that was exactly, but I've seen postcards of the place.
I'll try and dig one up.
__