Following...I’m in the same area as well.
You won’t find vacant houses at the courthouse. You can search for LP’s on the Official Records search.
Hi @Margot Tejera ! I dont believe there is a way to locate vacant properties in the Orange County courthouse database. The only off market deals I search for on there are pending Tax Deeds and Lis Pendens for foreclosures as @Wayne Brooks mentioned. Once I have that information, I usually will go over to the property appraisers site to get the owners information and then ride by the property to see if it is vacant.
Hope this helps!