It's already here, at least where I live (Spain). Property prices have dipped 20-30% in some cases, most especially those that were being rented out to tourists. And I can only forecast further dips with the rising numbers of unemployment, foreclosures and everything that is yet to come.
Sounds like just short-term and vacation rentals. They've been hit hard since nobody has been traveling. I've seen some stories about Airbnb hosts slashing rates 50% and such, desperate for bookings. There are signs of a rebound coming with lockdowns ending however:
https://www.prnewswire.com/news-releases/airbnb-booking-data-points-to-v-shaped-recovery-in-the-us-301056322.htmlWithin the United States, the Airbnb markets showing the fastest recoveries are concentrated in states that ended their lockdowns earliest. The most significant of these include Texas, Georgia, and Arizona, where 90-day Airbnb occupancy rates have increased by 9.99%, 8.28%, and 7.75% week-on-week, respectively.
A real crash in the traditional housing market would take a lot longer than a couple months to happen, especially with corona virus mortgage deferments temporarily stopping the bleeding.