The development is called The Preserve. Here is its website: https://www.fischerhomes.com/find-new-homes/communities/827/the-preserve/

Looks like the road that connects to Mackenzie is called "Preservation Parkway", and there's another one in here called "Snowy Owl Court".

Saint Louis County also has open data: https://data-stlcogis.opendata.arcgis.com/pages/open-data. The tax parcels are already available for the lots, but no addresses are on there yet.