Sinn Fein's Maeve McLaughlin tabled the adjournment debate calling for an end to delays in key planning applications in the Foyle constituency, on 6 November 2012.
Ms McLaughlin said there were nine major planning applications in the system.
She said there were huge delays in out-of-town applications, and listed the figures for vacant business premises in the Waterside and Cityside areas of the city.
Environment Minster Alex Attwood said that in many instances there was "a good narrative around planning in Derry".
Mr Attwood said that when the time came to devolve the planning process into the hands of local councils it would be important to "get it right".
The minister said some people were telling him to approve all the Derry applications and some were telling him to approve none
"It is very difficult to interpret what is coming back from Derry," Mr Attwood said
He said he would adopt a cautionary approach to the planning approvals.