The former president is under investigation over bribes he allegedly accepted from Brazilian construction firm Odebrecht to secure public works contracts.
Authorities in Peru raided two houses owned by former president Pedro Pablo Kuczynski as part of a money laundering probe, the public prosecutor's office said on Saturday.
Both homes are in Lima, the office announced on Twitter.
Television images showed officials entering the properties with boxes, a day after Congress accepted Kuczynski's resignation.
In another development, Kuczynski's defense team said it accepted a request from the prosecutor's office to ban the ex-president from leaving the country.
The former Wall Street banker, 79, is under investigation over bribes he allegedly accepted from Brazilian construction firm Odebrecht to secure public works contracts.
The bribes were allegedly paid to consulting companies linked to Kuczynski when he was finance minister under President Alejandro Toledo, who governed from 2001 to 2006.
Toledo is himself accused of receiving $20 million in kickbacks in return for awarding the Brazilian construction giant a contract to build a road in the Amazon.
Kuczynski offered his resignation Wednesday, a day before Congress was due to vote on impeaching him for lying about his ties with Odebrecht.
He had denied all links with the company until it revealed it issued the bribes in exchange for contracts in December.
On Friday, new President Martin Vizcarra, Kuczynski's vice president, was sworn in to replace him.
Kuczynski, had a strikingly short tenure as president: the former Wall Street banker was elected by a razor-thin margin in June 2016, and took office the following month.
But he lacked a majority in Congress, and was almost immediately embroiled in a messy conflict with the main opposition party, Popular Force, led by Keiko Fujimori, the daughter of disgraced ex-president Alberto Fujimori.
When reports emerged linking Kuczynski to Brazil's scandal-plagued construction giant Odebrecht -- accused of paying massive bribes to politicians around Latin America for juicy public works contracts -- Popular Force mounted a relentless push to remove the president from office.
Odebrecht revealed in December that it had paid nearly $5 million to consulting companies linked to Kuczynski when he was finance minister.
The former president survived a first impeachment vote that month. Three days later, he granted a pardon on medical grounds to former president Fujimori, who had been in jail for corruption and human rights violations.
That sparked speculation of a back-room deal with an opposition faction led by Keiko Fujimori's brother and sometime rival Kenji Fujimori.
When video tapes emerged of Kenji, who has now split from his sister's party, apparently offering bribes to a fellow lawmaker to vote against the December impeachment, the political damage to Kuczynski proved to be too much.
Facing a new impeachment vote, he announced his resignation on Wednesday, proclaiming his innocence but saying it was for the good of the country.