Enables DNA-binding transcription activator activity, RNA polymerase II-specific; RNA polymerase II cis-regulatory region sequence-specific DNA binding activity; and identical protein binding activity. Acts upstream of or within several processes, including fat cell differentiation; positive regulation of osteoblast differentiation; and regulation of transcription, DNA-templated. Located in nucleus. Is expressed in several structures, including early embryo; female reproductive system; gut; integumental system; and liver. Orthologous to human CEBPD (CCAAT enhancer binding protein delta). [provided by Alliance of Genome Resources, Apr 2022]