, an example of
New Indies Style architecture At the turn of the 20th century there was further significant changes in the colony. The Dutch by this period had managed to control most of the present-day Indonesian border. The Dutch had also implemented the
Dutch Ethical Policy that encouraged both entrepreneurial opportunities for Europeans and flow of foreign investment. There was also increasing interest in exploiting Indonesia's wealth in oil and gas, leading capitalists to further set an eye on the archipelago and the Dutch to upgrade its infrastructures. Significant improvements to technology, communications and transportation had brought new wealth to Java's cities and private enterprise was reaching the countryside. The architectural trend of the colony followed the Metropolis' status both in economic health and popularized style. At the early 20th century, most of the buildings in the colony were built in Neo Renaissance style of Europe which was already popularized in the Netherlands by
Pierre Cuypers. His nephew
Eduard Cuypers visited the Indies in 1909 and designed from Amsterdam in collaboration with his branch in Batavia several magnificent offices for
De Javasche Bank across the country. Eduard Cuypers would also establish largest architectural agency in the East Indies, till 1927 called Hulswit-Fermont, Batavia and Ed. Cuypers, Amsterdam. After the death of Eduard Cuypers, the office was called Fermont-Cuypers and designed more than a hundred buildings until 1957 across the country. Other prominent architect such as
Berlage designed two buildings strictly in Dutch style such as the Algemene Insurance company in Surabaya and a building in Batavia.
Cosman Citroen also had designed
Lawang Sewu in strikingly European appearance. in Batavia, 1912 (now Jiwasraya Building) However, by the 1920s, the architectural taste have begun to shift in favor of
Rationalism and
Modernist movement, particularly there was increasing
Art Deco architecture design influenced by
Berlage. In the first three decades of the 20th century, the Public Works Department rolled out major public building and city planning programs. The key designer was T. Karsten, who developed his predecessors' ideas for incorporating indigenous Indonesian elements into rational European forms. Bandung, which once was described as a "laboratory", is of particular note with one of the largest remaining collections of 1920s
Art-Deco buildings in the world, with the notable work of several Dutch architects and planners, including
Albert Aalbers,
Thomas Karsten,
Henri Maclaine Pont, J. Gerber, and
C.P.W. Schoemaker. A large number of train stations, business hotels, factories and office blocks, hospitals and education institutions were built in this period. With economic growth and increasing European migration to the colony, there was increasing middle class population and urbanization from the countryside. To accommodate this growth several modern
Garden Suburb were built across the cities of the Indies such as
P.A.J. Moojen's
Menteng in Jakarta, T. Karsten's New Candi Suburb in Semarang, and most of North Bandung. Various Dutch architects also made the Indies their architectural and engineering playground. This resulted to the introduction of 'Dutch architecture styles' such as
Nieuwe Zakelijkheid,
De Stijl and
Amsterdam School. But most architects were during first half of the 20th century more open to other more global stylistic influences as
Beaux-arts,
Art deco,
Expressionism, etc., than their colleagues in the Netherlands.. Most of which had survived and can be observed in design for colonial period offices, churches, public buildings and villas. Perhaps the highest form of "enlightenment" can be seen in
Villa Isola, designed by Schoemaker in Bandung. Several architect such as C.P.W. Schoemaker and H.M. Pont also made an attempt on modernizing the indigenous architecture of Indonesia, by incorporating it with western modernity, paving the way for the creation of vernacular
New Indies Style. The development of this architecture trend paralleled the growth of
Delft School of the Netherlands.
Bandung Institute of Technology, Pasar Gede of
Solo and Pohsarang Church in
Kediri are clear example of this experiment. The attempt of conforming with the local architecture had already begun since the early VOC period as appeared in the
Indies Style. The differences is whereas the Indies Style country houses were essentially Indonesian houses with European trim, by the early 20th century, the trend was for
modernist influences—such as
art-deco—being expressed in essentially European buildings with Indonesian trim (such as the pictured home's high-pitched roofs with Javan ridge details and often with more consideration for air ventilation). Practical measures carried over from the earlier Indies Style country houses, which responded to the Indonesian climate, included overhanging eaves, larger windows and ventilation in the walls. ==The outer islands==