Although row houses, canals and enclosed solid walls were first thought as protection against tropical diseases coming from tropical air, years later the Dutch learnt to adapt their architectural style with local building features (long eaves, verandahs, porticos, large windows
and ventilation openings). The Indo-European hybrid villa of the 19th century were among the first colonial buildings to incorporate Indonesian architectural elements and attempt adapting to the climate. The basic form, such as the longitudinal organisation of spaces and use of joglo and limasan roof structures, was Javanese, but it incorporated European decorative elements such as neo-classical columns around deep verandahs.