Check out google earth. Type in "Kunming" into the search area. Boom - Chenggong!

Not sure how the GE algorithms work.
Maybe they map to the registered government office.

Check Apple maps, maybe it is somewhere outside Chengdu.
Or maybe just Nocandu

I noticed it a few weeks ago. More recently I noticed that Google Maps show the old city hall in the location where it was torn down 12 months ago. I guess Google Maps needs to upgrade to Google Earth.