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:
| Name | Street address | Years as tallest | Height feet / m | Floors |
| --- | --- | --- | --- | --- |
| Wells Fargo Building | 309 SW 6th Avenue | 1907–1911 | 185 / 56 | 12.0 |
| Yeon Building | 522 SW 5th Avenue | 1911–1913 | 194 / 59 | 15.0 |
| American Bank Building | 621 SW Morrison Street | 1913–1927 | 207 / 63 | 15.0 |
| Public Service Building | 920 SW Sixth Avenue | 1927–1962 | 220 / 67 | 16.0 |
| Hilton Portland Hotel | 921 SW Sixth Avenue | 1963–1965 | 241 / 73 | 22.0 |
| Harrison West Condominium Tower | 200 SW Harrison | 1965–1969 | 256 / 78 | 25.0 |
| Union Bank of California Tower | 707 SW Washington Street | 1969–1970 | 268 / 82 | 15.0 |
| Standard Insurance Center | 900 SW Fifth Avenue | 1970–1972 | 367 / 112 | 27.0 |
| Wells Fargo Center | 1300 SW 5th Avenue | 1972–present | 546 / 166 | 41.0 |
Question:
What's the least amount of floors at 921 sw sixth avenue?
Answer:
22.0