Full Idea
Both properties and particulars can be taken as either sui generis or as constructions, so we have four options: both sui generis, or both constructions, or one of each.
Clarification
'Sui generis' means 'of their own kind' i.e. basic
Gist of Idea
We have four options, depending whether particulars and properties are sui generis or constructions
Source
Alex Oliver (The Metaphysics of Properties [1996], §09)
Book Reference
-: 'Mind' [-], p.21
A Reaction
I think I favour both being sui generis. God didn't make the objects, then add their properties, or make the properties then create some instantiations. There can't be objects without properties, or objectless properties (except in thought).