He moved to Copenhagen when he was 15 years old where he first became a merchant's apprentice.
Rønnenkamp subsequently established his own grocery business on Store Kongensgade.
He later established himself as a wholesaler and expanded his business with a sugar refinery in c. 1819.
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 had probably been established by  the Baltic Sea Guinea Trading Company (Østersøisk-guineisk Handelsselskab) in about 1893.

Rønnenkamp constructed the building at present day Amaliegade 4 located in the Frederiksstaden Quarter of central Copenhagen between 1828-29.
He sold  sugar from the premises and also expanded the activities to comprise refining and sale of salt.
He moved to Copenhagen when he was 15 years old where he first became a merchant's apprentice. Rønnenkamp subsequently established his own grocery business on Store Kongensgade. He later established himself as a wholesaler and expanded his business with a sugar refinery in c. 1819. 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 had probably been established by  the Baltic Sea Guinea Trading Company (Østersøisk-guineisk Handelsselskab) in about 1893. 
Rønnenkamp constructed the building at present day Amaliegade 4 located in the Frederiksstaden Quarter of central Copenhagen between 1828-29. He sold  sugar from the premises and also expanded the activities to comprise refining and sale of salt.
Christian Rønnenkamp