[1] After the war, he returned to Copenhagen where he founded Mansfeld-Büllner & Lassen in a partnership with a childhood friend who had become a photographer.

The product became so known that it was parodized in the revue Nytaarsnat 1872-73 at the Casino Theatre in Amaliegade and later that same year again in the comic operetta Malabarenken.

[3] Mansfeld-Büllner married Andrea Johanne Alvilda Rieneck (4 March 1849 – 30 April 1922), a daughter of master tailor Georg Wilhelm Rieneckm on 4 August 1870.

He lived at Bredgade 49 in Copenhagen before building the Osmanic Revival style Villa Hasa on Strandvejen in Skovshoved in 1898.

[1] Villa Hasa was demolished in 1938 to make way for an extension of Hvidørevej in connection with the construction of the new Kystvejen (Coast Road).