The investigation has focused attention on the policies of Crown Prince Mohammed bin Salman, Saudi Arabia's de facto ruler, who has imprisoned rivals, clerics and independent political activists at home.
During the initial search in October, police said they explored the buildings on the compound, but this morning authorities returned with dogs and drones to begin a more detailed investigation of the grounds.
There is also no confirmation of who ordered the killing. The assassins strangled and dismembered him before removing his remains, which have yet to be found.
Intelligence officials in several Western countries say the killing was nearly certainly carried out with either the authorization or knowledge of Saudi Crown Prince Mohammed bin Salman, the kingdom's de facto ruler.More news: Turkey says Saudi prince has asked to meet Erdogan at G20
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Police previously searched areas in Yalova as well as around Istanbul, including the Saudi Consulate, the nearby residence of the Saudi consul general and a forest on the outskirts of the city.
Turkey's steady release of investigative details has kept Saudi Arabia's leaders on the defensive and forced a belated Saudi admission that its agents were responsible for Khashoggi's death.
Khashoggi was killed in a rogue operation and Saudi Arabia has since arrested several suspects in the case.
Abahussain was among 17 Saudi nationals who were sanctioned by the U.S. Treasury Department this month for their role in the killing.
Turkey says the journalist was killed by a 15-member assassination squad sent from Riyadh.
Selvi wrote: "It is said that the Crown Prince gave an instruction to silence Jamal Khashoggi as soon as possible and this instruction was captured during the Central Intelligence Agency wiretapping".