Located in Karen, Nairobi, St. Bonaventure Formation house is home to Theology student friars who undertake their studies at Tangaza University college. The students here are drawn from various jurisdictions in Africa under the umbrella of AFCOF (African Federation of Conventual Franciscans) consisting of Kenya, Uganda, Tanzania, Zambia, Malawi, Burkina Faso and Ghana.

Theology studies is the last phase before one is ordained a priest and takes approximately four years. Before one is ordained a priest, the canon law stipulates that they have to receive the ministry of Lector (Reader) and Acolyte before being ordained a deacon, and eventually a priest.

According to our particular law, those to be ordained deacons must first have been received perpetually into the Order through the profession of Solemn vows. This means that through Solemn vows, one becomes a permanent member of the Order with both passive and active voice.

Friars at St. Bonaventure formation house live under the direction of formation masters (Rector and his assistants). Their work is to accompany theology students in discerning their vocation and advice the Minister Provincial on the suitability of candidates for priesthood. Some of the formators are also lecturers at institutions of higher learning especially in Philosophy and Theology.