Authorities said some of the properties were subject to rent-to-own, house swap or other agreements Coyle had with occupants and were never disclosed to the banks.
The government's plea memo said Coyle falsely claimed the properties were free and clear of any liens, claims or interests.
A 2009 Daily News investigation of Coyle's real-estate business said that after the loans closed, Coyle initially made payments but then stopped in 2008 and padlocked his Port Richmond office.
Once-stable homes Coyle purchased on the west side of Port Richmond were left to rot and many tenants had homes with no heat or window panes, leaky roofs, crumbling ceilings, creeping mold and seeping sewage.
Some of the properties remain vacant; others have been sold by the banks, and others are involved in complex civil litigation.
As part of his plea, Coyle has agreed to pay unspecified restitution to the banks and individuals who entered into rent-to-own agreements for properties collateralized by the two loans and who suffered financial losses.
A spokeswoman for the U.S. Attorney here said it appears most individuals with rent-to-own agreements have been able to stay in their homes.
Defense attorney Jeffrey M. Miller said Coyle's real-estate business is "basically insolvent" today. Miller said there were "a lot of mitigating factors" that would be raised at sentencing.
Coyle, who has no prior criminal history, is a former truck driver who got into the real estate business in the 1990s, Miller said.
Contact Michael Hinkelman at firstname.lastname@example.org or 215-854-2656. Follow him on Twitter @MHinkelman.