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 ft / m | Floors |
| --- | --- | --- | --- | --- |
| First National Bank Building | 170 Fourth Avenue North | 1905–1908 | 170 / 52 | 12.0 |
| The Stahlman | 211 Union Street | 1908–1957 | 180 / 54 | 12.0 |
| Life & Casualty Tower | 401 Church Street | 1957–1970 | 409 / 125 | 30.0 |
| William R. Snodgrass Tennessee Tower | 312 Rosa L. Parks Boulevard | 1970–1986 | 452 / 138 | 31.0 |
| Fifth Third Center | 424 Church Street | 1986–1994 | 490 / 149 | 31.0 |
| AT&T Building | 333 Commerce Street | 1994–Present | 617 / 188 | 32.0 |
Question:
What is the average number of floors at 170 Fourth Avenue North?
Answer:
12.0