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The City of Pasadena, California, uses Accela's Tidemark to maintain its tabular parcel data, address inventory, as well as to track planning, building permitting, and activities. The City also uses ESRI's suite of GIS products to maintain the City's spatial information. The City does not want to maintain multiple sets of parcel attribute data--one for the planning and permitting system, and one for the GIS system. Therefore, the City's Landbase combines GIS parcel data with information that is stored in Tidemark database. Maintaining, updating and synchronizing these databases present several challenges. This paper and session will describe those challenges and how the City of Pasadena is working to resolve them. Topics will include dealing with parcel splits and merges, dealing with "multi-parcel" or "tax-parcel" data, and tracking assessor parcel numbers and address changes.