Update: According to the OC Register, the planned project known as Jefferson Stadium Park at 1800 Gene Autry Way is indeed being proposed by another developer. The new developer is JPI/TDI Companies and is currently undergoing steps towards purchasing the 17.6 acre site. For further reading check out the OC Register's article at: http://www.ocregister.com/articles/jpi-676398-complex-platinum.html
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Looking at the City of Anaheim's map and list of development applications for July 28, 2015, there is a particular case number, DEV2015-00078, which indicates a new proposal for a mixed use project at 1800 E Gene Autry Way that consists of 826 residential units along with a total of 10,000 sq ft of retail space (Source).
Map of 1800 E Gene Autry Way:
Rendering of Previous Planned Project:
Google Streetview:
This update along with two other projects that are proposed/planned (e.g., Lennar's A-Town and the proposed mega project, LTG Platinum Center) and several projects that are under construction within the Platinum Triangle district such as the Jefferson Platinum Triangle and Platinum Gateway highlights the resurgence in development in the Platinum Triangle district.