According to reports from former residents, around 1910 the Guaiquica Farm already covered approximately 420 alqueires. Its dynamic owner devoted all available effort to its development, and with each passing year production and construction increased. Pedro Hereman implemented the equipment necessary for its maintenance and growth. A corn mill, rice and coffee processing machines, a cassava flour factory, an orange processing shed, a sawmill, a brickyard, a workshop, a warehouse, a school, and silos for storing agricultural products were installed. The farm’s five colonies were known as Headquarters Colony, Olaria Colony, Middle Colony, Flour Factory Colony, and Guaiquica Colony, where there were an agricultural tools workshop, three nearby residences, a warehouse, storage sheds, as well as the first pharmacy and the first classroom of the farm school, with a house beside it. This colony became the nucleus for the formation of the present urban center, called Engenheiro Coelho.

The farm experienced a period of remarkable development, based economically on coffee production, which was exported to Belgium, where the Hereman family owned a roasting company that marketed Brazilian coffee (Estrela Brasileira). The Heremans sold the company in 1980. In addition to coffee, they produced oranges, which were also exported to Belgium, England, and the Netherlands. Guaiquica also produced cotton, cassava, cereals, and housed

Pedro Hereman managed to change the route of the railway (Funilense/Sorocabana branch) so that it would pass through the interior of the farm, allowing all colonies to be located nearby. In 1912, a railway station was built in Guaiquica Colony, which became known by the same name, and from August 27, 1923, it was renamed “Engenheiro Coelho” in honor of Dr. Afonso Constante Coelho, who for many years served as an inspector of the Santos-Jundiaí Railway. According to reports, Pedro Hereman was an excellent administrator and promoter of education. He built and enabled the operation of a classroom linked to the municipality of Mogi Mirim, called the Guaiquica Rural School, managed by the State Department of Education. He loved music and, to encourage his workers, hired a teacher from Campinas to give them lessons, requiring them to attend regularly, under penalty of having part of their wages deducted if they did not show interest. In addition to this teacher, others hired to teach at the colony school were housed at the farm headquarters. Some older residents mention a curious fact about the owner of Guaiquica Farm (São Pedro). During his business trips to Europe, he required that the musical band, maintained at his expense, perform concerts upon his departure at the Port of Santos and at the Railway Station of