Tract guide · Silverthorne, Simi Valley

Silverthorne I

Silverthorne I is the western, first phase of Silverthorne: 121 single-family homes on units 1 through 3 of Tract 4998. The county recorded all three on August 15, 1997, for owner Rancho Cortijo 250, LLC. Streets include the western end of Evening Sky Drive, Bluebird Circle, Falling Water Court, Moonshadow Street, Rising Star Avenue and Sunlight Street.

Well documented: confirmed in official or multiple independent records.
Updated October 16, 2026 · Corrections: send a correction

At a glance

Silverthorne I quick facts

Also called	Tract 4998-1, Tract 4998-2, Tract 4998-3
Neighborhood	Silverthorne, Simi Valley
Builder	Rancho Cortijo 250, LLC (owner of record on the maps; its operating manager was Marr Ranch I, LLC)
Built	Late 1990s (maps recorded August 1997; homes selling by 1998)
Homes	121
Home types	Single-family detached homes, about 3,000 to 4,400 sq ft
Lot sizes	Mostly about 0.21 to 0.55 acre; median about 0.27 acre
Streets	Evening Sky Drive (west end), Bluebird Circle, Falling Water Court, Moonshadow Street, Rising Star Avenue, Indian Creek Place, Running Trails Avenue, Sunlight Street
Tract map	Ventura County Tract 4998, Units 1–3: recorded 1997 (131 MR 84 – 132 MR 8), about 88 acres
Gates	Not gated
HOA	Silverthorne Owners Association — Listed as a 121-unit association managed by GM Management. Registered with the state in 1998.

Highlighted: recorded Tract 4998, Units 1–3 (county GIS). Other outlines are neighboring tracts in Silverthorne.

About

About Silverthorne I

The Silverthorne Owners Association, listed as managed by GM Management, governs this phase. Assessor records show houses of about 3,000 to 4,400 square feet, on lots that are usually a little over a quarter acre. County deed dates show homes selling by late 1998.

Schools

Schools for Silverthorne I

School attendance areas

Simi Valley Unified School District
On SVUSD's attendance-boundary map (elementary map revised December 2023), this tract's recorded outline falls in:

Elementary: Big Springs Elementary School
Middle: Valley View Middle School
High: Simi Valley High School

These come from the district's own data, not from this site. Assignment goes by address, and districts change boundaries and run choice and transfer programs. Confirm with School Boundary Maps, or check an address here.

Part of

Silverthorne, Simi Valley

Silverthorne is a hillside neighborhood of about 250 single-family homes at the top of Yosemite Avenue in northeast Simi Valley, laid out along Evening Sky Drive. Its four tract maps were filed as Tract 4998 by landowner Rancho Cortijo 250, LLC and recorded in 1997 and 1998. The houses went up in two phases in the late 1990s and early 2000s.

The Silverthorne guide: HOA, schools nearby, services →