Collapse<br>An air conditioner fell in the office. Several objects started to fall afterwards. Everyone had to evacuate the building after an announcement. The office was relocated since the building was deteriorating. We didn't return into next year.
The fact that the building was deteriorating was an unknown quantity.
It isn't stated whether or not the deterioration was known.
( z0 know :ARG1 ( z1 quantity :domain ( z2 deteriorate :ARG1 ( z3 building ) ) ) :polarity - )
(z0 / know-01
    :ARG1 (z1 / quantity
              :domain (z2 / deteriorate-01
                          :ARG1 (z3 / building)))
    :polarity -)
The fact that the building was deteriorating was an unknown quantity .
z2 :ARG1 z3
z0 :polarity 0
z0 :ARG1 z1
z1 :domain z2