Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Landmark name | Date Built | Style | Location | Description |
| --- | --- | --- | --- | --- | --- |
| 1 | Gridley Building | 1867 | Second Empire | 101 East Water Street | Also known as the Onondaga County Savings Bank Building; 3½ stories; 100 foot clock tower; built of Onondaga limestone; Horatio Nelson White, architect |
| 2 | Gere Bank Building | 1894 | Louis Sullivan type | 121 East Water Street | 5 stories; built of granite, brick and terra cotta; Charles Colton, architect |
| 3 | Phoenix Buildings (portion) | 1834 | Federal | 123 East Water Street | 4 stories; brick |
| 4 | Phillips Block | 1834 | Federal | 125-127 East Water Street | 4 stories; brick |
| 5 | Phoenix Buildings (portion) | 1834 | Federal | 129 East Water Street | 4 stories; brick |
| 6 | Dana Building | 1837, 1861 | Federal, Italianate | 135 East Water Street | Italianate top floor added in 1861; 4 stories; brick |
| 7 | Grange Building | 1925 | Commercial | 203 East Water Street | Originally an auto dealership; 4 stories; brown brick |
| 8 | State Tower Building | 1927 | Art Deco | 109 South Warren Street | 22 stories; brick and limestone; Thompson and Churchill, architects |
| 9 | Granger Block | 1869, 1894 | Renaissance Revival | 200 East Genesee Street | Also known as the SA&K (Sedgwick, Andrews and Kennedy) Building and Ferary Building; first 4 stories built in 1869; upper three stories added in 1894; brick |
| 10 | Larned Building | 1869 | Second Empire | 114 South Warren Street | 5 stories; brick |
| 11 | Post Standard Building | 1880 | Richardsonian Romanesque | 136 East Genesee Street | 5 stories; brick |
| 12 | Franklin Buildings (portion) | 1870 | Second Empire | 134 East Genesee Street | 4½ stories; brick |
| 13 | Franklin Buildings (portion) |  | Federal | 132 East Genesee Street | 4 stories; stone |
| 14 | Franklin Buildings (portion) | 1834 | Federal | 128 East Genesee Street | 4 stories; brick |
| 15 | Franklin Buildings (portion) | 1839 | Federal | 122-126 East Genesee Street | 5 stories; brick |
| 16 | Flagship Securities Building | 1896 | Neo-Classical | 120 East Genesee Street | 3 stories; marble and brick; Albert L. Brockway, architect; first steel-framed building in downtown Syracuse |
| 17 | Onondaga County Savings Bank | 1896 | Neo-Classical | 113 South Salina Street | 9½ stories; granite and limestone; R.W. Gibson, architect; Angelo Magnanti designed plaster ceiling; William Teff Schwartz murals of Onondaga County history |
Question:
how many landmarks are in the hannover square historic district?
Answer:
17