user: Question: What is the name of the building that was the tallest from 1990–1997 in Frankfurt?
Columns: ['Name', 'City', 'Height (m)', 'Height (ft)', 'Floors', 'Years as tallest']
Types: ['text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['Commerzbank Tower', 'Frankfurt', 259.0, 850.0, 56.0, '1997–present']
SQL:

assistant: SELECT "Name" FROM "Table" WHERE "City" = 'Frankfurt' AND "Years as tallest" = '1990–1997';