Trendy sportswear retailer JD Sports Fashion has decided not to make an offer for its struggling rival JJB Sports.JD said it had asked JJB for details of a proposed restructuring of JJB's property portfolio through a company voluntary arrangement, but that it "received no further information whatsoever from JJB Sports."On the basis of the information it could garner from JJB's public announcements, JD decided not to make an offer. Shares in JJB fell back after the announcement, but JD's were among the best-performing in the FTSE 250.JJB said it "welcomes" the clarification from JD Sports saying it "will enable the Company to continue to focus exclusively on delivering its standalone restructuring plan with the support of its stakeholders."It added: "The board considered JD Sports' indicative proposal to be highly conditional and lacking sufficient certainty to be deliverable."JJB last month warned it could go bust unless landlords agree to cut rents on 95 stores it has earmarked for possible closure. The announcement came soon after the two companies revealed they were in offer discussions.JD's unique offering, whose emphasis is more on sports than fashion, has helped the company prosper in recent years, in contrast to the pile 'em high approach of JJB, which has failed to win over consumer.