There appears to be limited information available about a U.S. nonprofit organization specifically named "Southside Center" with the specified EIN and web details. Therefore, creating a Wikipedia-style article with the given details is not feasible. If more specific information about this organization becomes available, a detailed article could be constructed.

[1] https://spokanesouthside.org/about [2] https://spokanesouthside.org [3] https://southsidecenter.info [4] https://www.southsidecenterofhope.org/about-us/organizational-profile/ [5] https://www.southsidecenterofhope.org