Both of these matters were expressly considered by the Crown Solicitor in his report and the Deputy Solicitor-General in his peer review, police said.
"Those matters were also addressed in the Canterbury Earthquake Royal Commission report, the Beca report and the police report - all of which were considered as part of the investigation and decision-making process.''
The statement acknowledged that police did "fully agree'' that there were significant deficiencies in the building's design. Those deficiencies were all noted as part of the initial police investigation and by the Royal Commission and was also considered by expert opinions sought at the time.
"However, the Deputy Solicitor-General and ultimately the Crown Solicitor and police considered the evidential test was not met.
"Police concluded, and remain satisfied, that there was no reasonable prospect of obtaining a conviction in this case."
Police also acknowledged it had been a difficult time for the families of those killed.
"We have tried to be as open and transparent as we can in publishing information to assist in their understanding of the complex, technical issues involved.''