Sadly there's no mixed use buildings in the pack, explanation why by R3VO:
"Mixed use was not really compatible with the pack scope.
- We wanted to settle on a standard zone depth that is versatile and usable for everyone. Mixed zone buildings have their own set of rules (mainly the storefronts under you can see), which makes them more rigid assets, or require another set of custom storefront buildings.
- Their technical requirements are also different and is not as flexible as a regular medium density asset.
- Mixed zones are also not very flexible as a zone type, since it relies on the simulation being on-par on both residential and commercial requirements. Binding an entire zone to mixed felt unnecessary and too risky to deal with.
- Issues 1 and 2 can be rectified easily later with the custom content as we wouldn't be bounded by official requirements/technical guidelines.
- Making an entire zone type by just faking the storefronts/residential space wasn't really an option either. That said, some buildings still have ground floors modelled as a store to maintain a realistic visual representation.
- StarQ's Advanced Building Control mod allows the alteration of the zone type of the building, allowing you to make some of these buildings mixed. Obviously, we cant use mods to make region pack content so this is an option that is available to players. "