Delinquencies on commercial mortgages packaged and sold as bonds surpassed 10 percent for the first time last month, according to Morgan Stanley.

Payments more than 30 days late jumped 26 basis points to 10.15 percent in April, Morgan Stanley analysts said in a report yesterday. While the pace of increase has slowed since the middle of last year, that’s partly because delinquencies are being offset as troubled loans are resolved. The rate of borrowers missing payments for the first time has been constant for the past four months, the analysts wrote.

“The bottom line is that loan performance is not yet exhibiting significant improvement,” according to the analysts led by Richard Parkus in New York. “Many market participants have come to believe that credit deterioration is more or less over, and were caught off guard by April’s rise.”

Delinquency rates for loans bundled into securities during the bubble years, when property values peaked amid lax underwriting, have reached 10.37 percent for 2006 deals and 13.26 percent for those in 2007, according to Morgan Stanley.

Borrowers with maturing debt taken out during the boom are still struggling to retire loans, according to the report. About 63 percent of commercial mortgages in bonds scheduled to mature in April paid off on time. That rate dropped to 33 percent for loans taken out from 2005 through 2008, the analysts said.

Sales of commercial-mortgage backed securities are rising after plummeting to $3.4 billion in 2009 from a record $234 billion in 2007, according to data compiled by Bloomberg. Wall Streethas sold $8.6 billion of the debt in 2011, compared with $11.5 billion in all of last year, the data show. Sales may reach $35 billion this year, according to Standard and Poor’s.

Property Values Down

New bond offerings provide financing to borrowers with maturing loans. Still, property values are down 44.6 percent from October 2007, according to Moody’s Investors Service, making it difficult for property owners to come up with the difference when repaying the debt.

“Loans originated after 2005 had weaker loan characteristics,” Parkus said in a telephone interview. “On top of that, they were done at the peak of the cycle so they didn’t benefit from any price appreciation prior to the crisis.”

To contact the reporter on this story: Sarah Mulholland in New York atsmulholland3@bloomberg.net

To contact the editor responsible for this story: Alan Goldstein at agoldstein5@bloomberg.net