In December 2015, due to a possible closure of the institution, the entire building was declared a municipal heritage site, preventing any changes in its physical structure or removal of material goods.

The Congregation of the Carmelite Sisters of Divine Providence, defined as the institution's keeper, settled in Coronel Fabriciano in 1947 in order to handle the procedures related to the school's construction.

The Carmelite nuns Nazareth, Beatriz and Izaura, along with the director Mother Ester de Cristo Rei, were the first to settle in Coronel Fabriciano.

[2] On September 5, 1950, the Escola Normal Nossa Senhora do Carmo, also known as Colégio Angélica, was founded by the Archbishop of Mariana, Dom Helvécio Gomes de Oliveira, being the first big school in Coronel Fabriciano.

[2] At the same time, the Carmelite Sisters extended their activities to other sectors of society, such as teaching catechism to children in their own facilities in support of the Saint Sebastian Parish and providing social assistance to the residents of Morro do Carmo, where they developed courses in handicrafts, cooking, cutting and sewing.

[9][2] The 60th anniversary of Colégio Angélica, in 2010, was celebrated with festive solemnities and a section in the City Council of Coronel Fabriciano, where the bill granting the title of honorary citizenship to the Sisters Auxiliadora, Aracoeli and Donatila, benefactors of the school, was approved.

[17] On October 9, 2015, the Catholic Institute of Minas Gerais (ICMG), part of the Brazilian Union of Catholic Education (UBEC) - maintainer of Unileste - decided to take over the administration of the school,[18] but on December 18, almost two months after the opening of the enrollment period for 2016, the Congregation of the Carmelite Sisters informed the parents' committee and the ICMG that it would not grant the rental contract for the maintenance of the school the following year.

[19] The closing of Colégio Angélica was taken for granted and would leave 64 employees unemployed and 360 students from kindergarten to elementary and technical school having to enroll in other institutions.

Until the conclusion of the Saint Sebastian Cathedral, the schoolyard was used for the celebration of the parish masses when there was a larger public expectation,[25] as well as parties, balls, and sports competitions in the city.