Table:
0
A
B
C
D
E
1
Name
Height m / ft
Floors
Year
Notes
2
L'Avenue
175 / 574
50
2017
75% Sold. Construction to begin this year.
3
Roccabella (West Tower)
147 / 482
40
2017
East Tower began construction on March 4, 2013.
4
Tour Quartier des Spectacles
145 / 476
31
2017
Should begin construction by April 2014.
5
Tom Condos
122 / 400
40
2016
48% Sold. Due to begin construction December 2013.
6
YUL Condos
120 / 393
38
2016
Should begin construction by Spring 2014.
7
Babylone Condos
120 / 393
37
2016
Due to begin construction in 2014.
8
Le Peterson
105 / 344
31
2016
50% sold. Begins construction October 17, 2013.
9
Waldorf Astoria Montreal
105* / 344*
32
2020
Approved. Stale proposal.

Questions and formulas:
Question: How many years have a Name of tour quartier des spectacles, and Floors smaller than 31?
Formula: ROWS(UNIQUE(FILTER(D1, (A1="tour quartier des spectacles")*(C1<31))))
Formula2: ROWS(UNIQUE(FILTER(D2:D9, (A2:A9="tour quartier des spectacles")*(C2:C9<31))))
Level: medium