Black_Diamond
The conversation in this note has been a very interesting read. Right now, there is a boundary between San Jose and Cambrian Park here: https://www.openstreetmap.org/way/1089373503/history

That boundary was first added last year, which is well after the last comment. The latest version matches what Santa Clara LAFCO, County of Santa Clara Map, Santa Clara County Tax Assessor map and the City of San Jose GIS Viewer contain. They all state that the inner part is unincorporated, and the outer part is the city boundary. That boundary was fine tuned with satellite imagery to match obvious property lines, like fences.

I consider this issue resolved and this area currently represents current boundaries.

You may also be interested in seeing what is planned to be built near this area. https://www.sanjoseca.gov/your-government/departments-offices/planning-building-code-enforcement/planning-division/environmental-planning/environmental-review/active-eirs/cambrian-park-mixed-use-village-project