Eight classes of JPMorgan Chase Commercial Mortgage Securities Corp. (JPM) securities certificates were downgraded by Fitch Ratings. The downgrade involves series 2006-LDP7 commercial mortgage pass-through securities certificates. The bonds were downgraded based on greater uncertainty about losses on specially serviced loans. Fitch said it has designated 60 loans as "loans of concern." The total pool of loans has an aggregate balance of $3.5 billion, down from $3.9 billion at issuance. The largest contributor to the pool's losses is a portfolio secured by four regional malls. The portfolio is spread across Ohio, Connecticut, Missouri, California and Colorado, Fitch said. The Midway Mall in Elyria, Ohio, is one of the largest contributors to the decline in the portfolio's performance. The mall remains only 62% occupied, Fitch said. It continues to battle falling income levels, low market rents, tenant issues and the nation's current economic woes. A 393,000-square-foot office property in Atlanta is the second largest contributor to the loss. The property was built in 1980 and ended up in special servicing in June 2010 due to imminent default after to large tenants left the office property. CB Richard Ellis is the property manager and leasing agent for the property. It's occupancy levels remain at 40%. Write to Kerri Panchuk.