The records of the Robert Royston collection span the years 1941-1990, with the bulk of records spanning 1946-1971. The collection is organized into nine series: Professional Papers, Faculty Records, Office Records, Project Records, and five Major Projects: Bay Area Rapid Transit (Bart), California State University: Stanislaus College, San Joaquin Delta Junior College, University Of California, San Francisco, University of Utah. Within these series original order has been maintained wherever it is evident.

The vast majority of this collection documents the projects of Royston's various firms, with a much smaller representation of Royston's work outside the firm in the professional or academic context. Royston's work with many individual architects including John Lyon Reid, Henry Hill, Claude Oakland, John Dinwiddie, Fred Langhorst, Mario Corbett, Worley Wong, William Wurster, Callister & Hillmer, and John Funk is documented in the project records. Of particular interest is Royston's participation in the landscape design for various sub-divisions and individual houses built by Eichler Homes and T. Jack Foster and Sons (Foster City). In addition, the many projects funded by FHA and HUD reflect both these organizations' involvement in design and development.

Projects that received AIA awards were the T. Jack Foster residence in Orinda (1953) designed in conjunction with Henry Hill, and Hillsdale High School (1956), by John Lyon Reid. The firm received ASLA merit awards for Marina Vista Redevelopment, Quarry Theatre at UC Santa Cruz (1970), and Sunriver Properties (1971). The firm's work has been published in both national and international journals including Sunset Magazine, Architectural Forum, Huestra Arquitectura and L'Architecture d'Aujourd'hui. The records in the Major Projects series were partially pulled together by the firm over a number of years. In order to make the projects more coherent, the remainder of various jobs related to each major project were pulled together into one arrangement. The firm's many professional relationships that spanned decades while completing extensive planning for institutions are documented in these series.