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:
| Rank | Name | Built | Height | Floors |
| --- | --- | --- | --- | --- |
| 1.0 | Blue, MediaCityUK | 2010.0 | 90 metres (300ft) | 18.0 |
| 2.0 | TheHeart, MediaCityUK | 2010.0 | 82 metres (268ft) | 22.0 |
| 3.0 | North Tower | 1966.0 | 80 metres (262ft) | 25.0 |
| 4.0 | Briar Hill Court | 1970.0 | 75 metres (246ft) | 25.0 |
| 5.0 | NumberOne, MediaCityUK | 2010.0 | 74 metres (241ft) | 22.0 |
| 6.0 | White, MediaCityUK | 2010.0 | 68 metres (223ft) | 15.0 |
| 7.0 | Millennium Tower | 2008.0 | 67 metres (220ft) | 21.0 |
| 8.0 | Sovereign Point | 2005.0 | 66 metres (217ft) | 20.0 |
| 9.0 | Churchill Court | 1970.0 | 66 metres (217ft) | 23.0 |
| 9.0 | Fitzwarren Court | 1970.0 | 66 metres (217ft) | 23.0 |
| 9.0 | Bronte Court | 1970.0 | 66 metres (217ft) | 23.0 |
| 9.0 | Spruce Court | 1969.0 | 66 metres (217ft) | 23.0 |
| 9.0 | Thorn Court | 1969.0 | 66 metres (217ft) | 23.0 |
| 14.0 | City Lofts | 2007.0 | 61 metres (200ft) | 21.0 |
| 15.0 | The Edge (B) | 2005.0 | 60 metres (197ft) | 18.0 |
| 15.0 | The Edge (C) | 2005.0 | 60 metres (197ft) | 18.0 |
| 15.0 | Charter House | 1970.0 | 60 metres (197ft) | 20.0 |
| 15.0 | 5 Exchange Quay | 1997.0 | 60 metres (197ft) | 20.0 |
| 19.0 | Orange, MediaCityUK | 2010.0 | 58 metres (190ft) | 9.0 |
| 20.0 | NV Building 1 | 2004.0 | 55 metres (180ft) | 18.0 |
| 20.0 | NV Building 2 | 2005.0 | 55 metres (180ft) | 18.0 |
| 20.0 | NV Building 3 | 2005.0 | 55 metres (180ft) | 18.0 |
| 20.0 | Peel House | 1976.0 | 55 metres (180ft) | 16.0 |
Question:
What is the lowest Floors, when Built is greater than 1970, and when Name is NV Building 3?
Answer:
18.0