Summary records of property transactions, based on block numbers and periods of time, that serve as indexes to (Land Records) in series C205 and C2842. An 1886 law (Ch. 289) directed the clerk of the Baltimore City Superior Court to develop a new plan for indexing land records, subject to the approval of the judges. The resulting block book system was based on the sequential numbering of each block in the city. Initially the block numbers ranged from 1 to 2073, and the indexing system was applied retroactively to include all land records dating back to 1851. Annexations to the city were handled simply by assigning higher block numbers: 2100 to 4199 in 1888 and 4200 to 8491 in 1918. New developments were managed by assigning sequential alphabetical suffixes to the base block number. Block numbers can be obtained from (Block Maps) in series C2845 and C2837. The records are first grouped by periods of time, such as 1918-1925, and then numerically by block number. Entries under each block number provide dates of the transactions, names of the parties involved, types of instruments, locations or addresses of the property, and book and page references to (Land Records). Also available on film in series CM197. Records after 1953 appear in (Block Book) in series C2838 and C2836. The series consists of 323 volumes, each containing an average of 212 pages. Images for these records are available in CE10 which are scans from CM197.