Trust banks such as State Street Corp. (STT) and Bank of New York Mellon Corp. (BK) may be a safer bet than commercial banks in uncertain times, but low interest rates are one caution Goldman Sachs highlighted Monday morning.

The firm cut its sector view of trust banks to neutral from attractive, saying rates could be an "ongoing headwind" that counteracts strong markets.

Bank of New York Mellon was singled out for a downgrade to neutral from buy by Goldman analysts led by Brian Foran, who said that revenues from the bank's money market mutual funds and its corporate bond trustee business may be disappointing if low rates persist.

Nearly one-third of Bank of New York Mellon's revenues come from money market mutual funds and issuer services, which includes the bond trustee business, and "both of these businesses are likely to be declining over time," the analysts wrote.

Credit write-downs will also be a factor: The bank has $7 billion of Alt-A securities, $1.5 billion in commercial mortgages and $500 million in construction loans, of which Goldman predicts $350 million in third-quarter losses.

The firm cut its third-quarter earnings view for Bank of New York Mellon to 30 cents per share from 50 cents, and its 2010 earnings estimate to $2.25 from $2.75.

The more sober view of Bank of New York Mellon contrasts with the view of some on Wall Street who continue to keep favorable ratings on the shares.

Last week, Rochdale Securities banking analyst Richard Bove credited what he called the bank's "home run" agreement with the Russian government to resolve a $22.5 billion lawsuit by Russia's Customs Service.

"This stock is very attractive and should be bought," Bove wrote in a note to clients.

Bank of New York Mellon Corp. shares fell 2.6% in premarket trading Monday, to $29.52.

-By Brendan Conway, Dow Jones Newswires; (212) 416-2670; brendan.conway@dowjones.com