 It is worth noting that platonists who argue for properties and relations in conjunction with propositions — i.e., by first arguing for propositions and then claiming that properties and relations are components of propositions — will have an easier time arguing that properties and relations couldn't exist in our minds (as conceptualists say) or in things (as immanent realists say). In connection with conceptualism, platonists of this sort could claim that the argument given in  section 4.2  for thinking that ‘that’-clauses don't refer to mentalese sentence tokens suggests that propositions (which are the referents of ‘that’-clauses) could not be made up of properties that exist in our heads. And in connection with immanent realism, platonists of this sort could argue that propositions couldn't be composed of immanent-realist properties, because people can believe propositions that are composed of properties that are not instantiated in the physical world. For instance, it seems that sentences like ‘Johnny believes that there is a four-hundred-story building in Sally's backyard’ can be true, and so according to the above platonist argument for propositions, there must be such a thing as the proposition that there is a four-hundred-story building in Sally's backyard. But if propositions have properties as components, then this proposition has as a component the property of being a four-hundred-story building. But if properties exist only in physical things, as immanent realists suggest, then there is no such thing as the property of being a four-hundred-story building, since presumably, nothing in the universe has this property. Thus, the conclusion here is that if propositions have properties as components, then the properties in question have to be transcendent, platonist properties, not immanent  properties.[12]