It would be cool to have a DLC that allows you to create realistic strip malls. You could start with a larger store like a supermarket for example, then plop stores on the sides of it. There could be different sizes of plopable storefronts, allowing a variety of commercial or even some offices to move in. Maybe there could be different styles of strip malls similar to the different airport styles from CS1. Each store would have a frontal road directly next to it where you can draw parking lot roads (either vanilla or custom DLC parking lots) to create a seamless connection. The frontal roads could act in a similar way to the taxi ways from the airport DLC in CS1.
This could create the opportunity to have grocery stores become a new mechanic in the game. In real life, it is important for health and happiness to live near a healthy source of food, as it is a regular shopping destination (usually once a week). It may be fun to have grocery stores as a need for citizens in the game. Living near a grocery store could increase land value, happiness, health, etc.