The present main building was constructed in 1845–46 to a Neoclassical designs by Gustav Friedrich Hetsch, but was heightened with one storey in 1890.

He was the first member of his family to carry the name Harbou and owned a number of estates on Langeland.

He had the following year married Karen Urne, daughter of a major landowner on Funen and Langeland.

Egeløkke was after Niels Harbou's death in 1679 passed to his son Otto.

He had already designed the new main building at Steensgård which belonged to the owner's brother Vincents Steensen-Leth.