The former barn of Den Eikenhorst estate was converted into offices in 1998. Recently, part of the loft has been converted into office space, connected to the open office floor through a blue steel spiral stair. In addition, the interior has been completely renovated.

The roof has been fitted with high-quality insulation. The former hay trap has been turned into a window and four steel skylights have been added to the north side of the roof. The design rooms have seen the addition of a new meeting table and a lunch/flex work/consultation corner. In the entrance hall, a new library with a wall unit has been realised. The former meeting room has been converted into a board room. A number of side rooms - the former stables - now fulfil the role of silent work areas. BiermanHenket has been based in the barn-turned-office of the listed Den Eikenhorst estate since 1998. The mansion was built at the start of the 19th century as a summer residence and around 1850 landscape architect Zocher Jr designed the surrounding gardens in the English landscaping style.