user: Question: What is the lowest Floors, when Built is greater than 1970, and when Name is NV Building 3?
Columns: ['Rank', 'Name', 'Built', 'Height', 'Floors']
Types: ['real', 'text', 'real', 'text', 'real']
Sample row: [1.0, 'Blue, MediaCityUK', 2010.0, '90 metres (300ft)', 18.0]
SQL:

assistant: SELECT MIN("Floors") FROM "Table" WHERE "Built" > 1970.0 AND "Name" = 'NV Building 3';