If we extract the adjectives from these examples we receive the declension of adjectives if there is a possessive pronoun.

declension of neu as an adjective neutral singular plural masculine singular plural feminine singular plural   Nominative neues neuen Nominative neuer neuen Nominative neue neuen   Genitive neuen neuen Genitive neuen neuen Genitive neuen neuen   Dative neuen neuen Dative neuen neuen Dative neuen neuen   Accusative neues neuen Accusative neuen neuen Accusative neue neuen

Endings of the declensions neutral singular plural masculine singular plural feminine singular plural   Nominative -es -en Nominative -er -en Nominative -e -en   Genitive -en -en Genitive -en -en Genitive -en -en   Dative -en -en Dative -en -en Dative -en -en   Accusative -es -en Accusative -en -en Accusative -e -en