This was a city before the apocalypse.
After the outbreak, many people survived and decided to survive in various different locations across the city such as Daniel's Warehouse and Tamplin's Grocery. Over time, these people died. At some point, Daniel encountered a warehouse owner, and said owner gave him access to his warehouse before he passed away. Daniel either acquired Skidmark from this individual or found him in his travels, but regardless they became inseparable afterwards. Althea Szewczyk-Przygocki eventually came across Daniel and interviewed him as well.