gfysgerm
https://www.bing.com/maps?q=castonguay+private%2c+ottawa&mkt=en&FORM=HDRSC4
I can confirm this is a playground by the sandbox and play structures, but it's not an official Ottawa Park, it's more like the builders of the development put a park there(shared amongst the terrace buildings)

Source: I just went there, no City of Ottawa signage, pathways exist.