Officials have been inspecting a second balcony at the apartment complex in Berkeley, California, where six students died earlier this week.
Inspectors say the second balcony is "structurally unsafe" and is at risk of collapsing.
The process is ongoing to remove the balcony, which is one floor below the one that collapsed leading to the deaths of five Irish students and one Irish-American.
Seven other students were injured in the incident.
Examinations are continuing at the remaining two balconies at the apartment complex at 202 Kittredge Street in the university town.
City officials are continuing their investigation on the collapsed balcony and said they would announce the results once it was completed.
The balcony from Unit 405, which collapsed in the early hours of Tuesday morning, is being held in official storage pending further examinations.
The #Berkeley inspectors are removing 2nd balcony as it was "structurally unsafe & posed a collapse hazard" @rtenews pic.twitter.com/xrlko54vic
— Caitriona Perry (@CaitrionaPerry) June 18, 2015The second balcony will also be held once it has been removed.
Inspectors spent yesterday examining the balcony from inside the apartment and from the outside using cranes.
Officials said the balcony was built to the correct standards when it received its final approval in 2007.
However, the weight-bearing minimum standards have since been increased but were not made retroactive.
At that stage balconies needed to be built to withstand 50lbs per square foot, however that has since changed requiring balconies to be able to hold 100lbs per square foot.
The city officials said that since its construction, the building has been subject to inspections by the Housing Code Enforcement and for any tenant improvements.
In a statement they said that the type of building is sometimes referred to as a "podium building," meaning that it has four residential stories of wood frame construction above the first storey, which is concrete and steel construction.
The contractor was Segue Construction Inc. The architect is Thomas P Cox Architects.
Segue Construction has said in a statement it will cooperate fully with investigating authorities.
City officials are also endeavouring to make many public documents available online within the next 24 hours.
In a statement, the City of Berkeley said there was extensive documentation relating to the building; its plans were first submitted in 2002 and it completed construction in 2007.
Several independent experts have said the horizontal support beams of the balcony probably weakened due to wood rot from exposure to excess moisture.
A number of structural engineers interviewed by Reuters said the balcony should otherwise have been sturdy enough, under normal circumstances, to safely bear the weight of the 13 people who were on the deck at the time.
Experts agreed that defects in the design, installation and maintenance of waterproofing, flashing materials and ventilation could leave untreated wood framing especially vulnerable to decay.
Otherwise, they said the use of wooden timbers to support cantilevered platforms in such construction was commonplace.
Those spoken to by Reuters also dismissed suggestions the balcony would have been built as an architectural feature, saying any exterior platform with a door would only be permitted if designed and built to full code.
City of Berkeley mental health staff have also created a resource centre to provide counselling and grief support.
The city said it has also offered other logistical help to the families and the Irish Consulate.
