He constructed the listed property at Amaliegade 4 in Copenhagen and owned the estates of Næsbyholm and Bavelse from 1835.

He moved his business to the corner of Sankt Annæ Plads and Amaliegade after acquiring the former St. Croix House in auction in late 1828.

St. Croix Sugar House was likely established by the Baltic Sea Guinea Trading Company (Østersøisk-guineisk Handelsselskab).

[4][5] Rønnenkamp constructed the building at present-day Amaliegade 4 located in the Frederiksstaden Quarter of central Copenhagen between 1828 and 1829.

[10] Rønnenkamp left the estates at Næstbyholm and Bavelse to his sister Hanna's grandson, Peter Christian Müller (1854–1930), who adopted the surname Howden-Rønnenkamp.