The first volume of Yakovlev's book on the Alexander Palace (published 1927) discusses the exteriors and technical aspects of the palace. However, it does include some interior plans I don't recall seeing before...
Plan of first level:

(between pages 32 and 33)
Variant plan of first level:

(between pages 48 and 49)
Plan of first and second level of kitchen building:

(page 59)
Plan of the first level:

(between pages 112 and 113)
Plan of Tsarskoe Selo park:

(between pages 144 and 145)