This paper suggests that there are two types of preposed PPs in English: locative PPs and subject PPs. This is on the basis of the syntactic patterns of preposed PPs in PP Subject Constructions. In explaining preposed PPs, locative PPs have subject and non⋅subject properties differently from subject PPs. I proposed that subject PPs are induced by syntactic EPP; however, locative PPs are motivated by discourse EPP. More precisely dual properties of locative PPs can be covered by assuming a new projection RefP(Referential Phrase) in terms of Split CPs, thereby extending Last Resort to Scope-discourse interpretive property in Rizzi(2004). This paper shows subject PPs occupy Spec TP and locative PPs occupy Spec RefP, and that the mixed properties of subject and non⋅subject that the preposed PPs display can be explained under (non)Specificity.