Twenty years later, a competition was announced for Primorska Street – Prilaz, and the winner was architect Viktor Kovačić with the project "DEO".

The church has a Greek cross ground plan, and is vaulted by a central dome of reinforced concrete construction, the first of its kind in our country, and was a very technical achievement in its time.

Like those in the church of St. Mary in Bijaći from the 9th century, and in the cathedrals in Poreč, Rab, Zadar, Trogir, Split, Korčula, Kotor and Zagreb, here too the baldachin stands on the main altar above the tabernacle in the middle of the apse, placed on four columns with capitals, which are decorated with 16 different symbols of the religious character, and ends with a superstructure – a pyramid.

On the arches is carved the text of the prophet Malachi: "From the rising of the sun to the setting my name is great among the nations and in every place a pure sacrifice is offered to my name" (Mal 1, 11).

It is also worth noting the execution of the side altars of the Mother of God and the Sacred Heart of Jesus, as well as the relief of St. Anthony in the church's vestibule, carved in white Carrara marble by Prof. Ivo Kerdić.

The beautiful nativity scene of the church of St. Blaise was completed on the Christmas Eve of 1916, according to the design of the sculptor Vojta Braniš, a student of Robert Frangeš-Mihanović.