Howard Hughes Holdings (HHH) said Monday it has extended its standstill agreement with Pershing Square Capital Management to be effective until April 15, unless it is extended further.

The deal, which was previously extended to be effective until April 7, was entered into by the companies to discuss potential alternatives after Howard Hughes rejected Pershing Square's proposal to acquire 10 million newly issued common shares for $90 apiece.

Howard Hughes said there's no assurance that talks with Pershing Square will lead to any specific outcome.