Around 13 security personnel and a civilian were killed in the incident.
Chief Minister Jai Ram Thakur visited the building collapse site said it was a very "unfortunate" incident and has ordered an investigation into it.
The chief minister also said, ''I had ordered to send my official chopper to go to Suni and bring the equipment necessary for relief work. This time our priority is the rescue operation. I have given an order for an investigation into the incident."
"The information I have till now is that the structure of the building was not as per the specifications but we can only say anything officially after the investigation is over," He further added.
The Deputy Commissioner of Solan KC Chaman said that the rescue operation will be completed by today afternoon.
"We can complete the rescue operation by afternoon today. We have given interim monetary relief to grievously injured, casualties and minor," KC Chaman said.
The building, located in Kumarhatti, collapsed on Sunday following heavy rain in the region.