INDIANAPOLIS-Simon Property Group said it has pulled back its bid for London-based Capital Shopping Group, a firm that owns 13 shopping centers in the United Kingdom. However, it is still encouraging investors in CSC to reject a $1.2 billion purchase of Trafford Centre Mall in London.

Simon is a 5.1% owner in CSC, and has protested the mall’s purchase, going as far as to offer to buy the company outright to prevent the acquisition. The bid was ignored by CSC, which said they didn’t believe Simon was serious about a takeover attempt, but CSC officials did move the decision meeting to buy the mall from late December to Jan. 26.

Tuesday, Simon admitted that the takeover just isn’t possible, blaming CSC for not cooperating with due diligence requests. “Despite numerous overtures from Simon and in full knowledge that Simon, given this due diligence precondition, is not able to announce a firm offer without it, the CSC Board has refused to share any due diligence information with Simon,” according to a Simon statement Tuesday. David Simon is CEO of the real estate investment trust.

Simon also blasted slight revisions that CSC has made to the Trafford purchase, saying the price is “still too high.” “The revised terms do not address Simon’s fundamental concerns and the transaction remains deeply unattractive for CSC shareholders,” the REIT said in the statement.

For its part, CSC said Tuesday that it continues to advocate for the Trafford purchase. “It is a very rare opportunity to acquire 100% of a preeminent UK out-of-town regional shopping centre,” the company said in statement, and will strengthen the firm’s position in the marketplace.

An information packet sent to CSC investors on Jan. 7 was labelled clearly on the front “Ignore Simon’s opportunistic and inadequate proposal.” A letter at the front of the packet by CSC Chairman Patrick Burgess said that Simon is undervaluing his company and its prospects.