Riverside is an unreleased neighborhood for The Sims 2. The neighborhood was scrapped to make room for the three pre-made hoods that were released in the final game. A third-party group called "The Riverside Group" set out to re-create the entire hood based on the released official screenshots.
The hood was originally developed by Thsms204, but it was scrapped and cancelled. The hood was also reported to be corrupted, making it undesirable for downloaders. However, another group was formed, called the aforementioned "The Riverside Group", and set out to make a clean, uncorrupted, and base-game compatible version of Riverside. After years of hard work, the final product has finally arrived.
Download it here.