A Berkeley police officer and two engineers in a hanging basket photograph a balcony collapse at an apartment building on Kittredge Street in Berkeley, Calif., Tuesday, June 16, 2015. Six people were killed and seven others were taken to area hospitals. (D. Ross Cameron/Bay Area News Group Archives)
D. ROSS CAMERON A Berkeley police officer and two engineers in a hanging basket photograph a balcony collapse at an apartment building on Kittredge Street in Berkeley, Calif., Tuesday, June 16, 2015. Six people were killed and seven others were taken to area hospitals. (D. Ross Cameron/Bay Area News Group Archives)

Tenants of an apartment in Berkeley, Calif., had complained to building managers for weeks that mushrooms were growing from a wooden balcony before it collapsed in June, killing six and injuring seven others. The claims were included in a negligence lawsuit alleging the building owners and construction company could have prevented the accident. The mushrooms were evidence that water had affected the balcony's framing, later found to be rotten, but the warnings were ignored, the lawsuit says. Read More