A decent-sized patch of solar panels.
If they spaced them out a few yards and grew "shade" or "semi-sun" crops in between, they could lower watering costs and create dual-use of the land.
Even support the local wildlife eating the insects who are eating the plants.
A good example of intelligent dual-usage in a pure urban setting
(i.e. returning to your nice cool car, after hours of shopping, and not having to worry about unintentionally baked potatoes):
https://www.cnn.com/2022/03/20/us/solar-power-on-big-box-store-rooftops-climate/index.html
At the IKEA store in Baltimore, installing solar panels on the roof and over the store's parking lot cut the amount of energy it needed to purchase by 84%, slashing its costs by 57% from September to December of 2020, according to the company. (The panels also provide some beneficial shade to keep customers' cars cool on hot, sunny days.)