The chief executive of Intu, David Fischel, is leaving after 17 years in the role.
The shopping centre group had been in takeover talks with larger rival Hammerson. However, the £3.4bn offer foundered after Hammerson walked away.
Intu's chairman John Strachan, said: "Under the proposed Hammerson merger, David was expecting to stand down upon the transaction completing.
"That transaction is no longer proceeding, and the board is enormously grateful to David for agreeing to remain in post for a longer period than he had envisaged, giving the board sufficient time to search for a suitable successor."
It also provided a snapshot of embattled retail sector in its interim results.
Like-for-like net rental income grew by 1.3% but said it had taken a 0.9% hit from tenant failures.