There are calls for more to be done after a man's body lay undiscovered for a week after he died.
The body of 28-year-old Tony Dempsey was discovered in a ground floor flat at Kevin Barry House on Coleraine Street in north inner-city Dublin shortly before 6.30pm on Monday.
It is believed he suffered a violent assault.
Gardaí upgraded the case to a murder inquiry after a post mortem examination on Tuesday.
Christy Burke is a local councillor for the area. He told Newstalk Breakfast reports had been made about the property.
"Yesterday locals were absolutely shocked and horrified to think that a murder took place.
"My heart and my sympathies go out to the family of Mr Dempsey.
"There had been reports from locals for a number of months - the reports apparently fell on deaf ears.
"Had they fell on proper ears to take action, Mr Dempsey could be alive this morning.
"There was comings and goings, there was drinking, there was drug use - and the fact that Mr Dempsey's body was left decomposing for possibly a week is heartbreaking to think that it was left in that condition while there were people coming and going in the flat, and doing whatever they do".
Mr Burke said more steps need to be taken.
"We're going to have to put in place now - Dublin City Council and McVerry Trust, and other housing bodies - that if there's complaints made about anti-social [behaviour], that they're addressed in the proper legal manner.
"That may help and prevent further deaths".
'Tenancy began to break down'
In a statement the Peter McVerry Trust confirmed the apartment was managed by its charity under the Housing First programme for Dublin City Council.
Tenants of Housing First are selected for the programme because of their level of vulnerability and a significant history of rough sleeping.
"The tenant in the property matched the Housing First criteria and was successfully accommodated in the property over 18 months ago", the charity said.
"Unfortunately, the tenancy began to break down over recent months as the tenant was struggling to manage the front door and individuals, who had no interest in the property or the tenant's recovery, were gaining entry to and using the property.
"Steps were actively taken to support the client to surrender the tenancy with a view to being supported in another tenancy elsewhere.
"This process was being carried out in line with the rights of the tenant. PMVT also increased staff visits to the property" it added.
Pat Doyle, CEO of Peter McVerry Trust, said: "We're saddened at the loss of a young life and wish to express our sympathies to the family of the deceased.
"The man was known to our organisation but was not a current service user."
He added: "Staff visited the property daily, including over the weekend, and they had no indication or evidence that someone was deceased at the property or in the vicinity.
"Housing First helps some of the most vulnerable in our society.
"86% of the tenancies under Housing First are successful, but unfortunately this was one of the 14% which was clearly failing over recent months.
"Peter McVerry Trust is fully cooperating with the Garda and is mindful of the impact on our own staff who deal with very complex situations on a daily basis, on the tenant whose tenancy has been ruptured, and on the broader community", Mr Doyle said.