The Church of St. Alexius the Man of God was built simultaneously with the Holy Gates of the Assumption Monastery between 1709 and 1714 and was consecrated in 1720. To complete the construction, the abbess and the nuns had to collect donations from believers in Moscow and other cities. The church is made of stone, it is cold, one-story, with one dome and one altar. It was originally planned to consecrate two altars: one in honor of St. Nicholas the Wonderworker and the other in honor of Alexius, the Man of God. The monastery's gate church had two passages, a side door, and the former Holy Gates. The lower floor, previously included in the monastery's enclosure, served as the temple's basement. On the smooth walls of the first floor, a second tier was erected, decorated with half-columns and moldings with baroque pediments. The upper floor housed the temple itself with four windows on the facade, giving the building a residential character. The church was topped with a dome in the classical style. Inside the temple was an ancient icon of the Not-Made-By-Hands Savior depicting many saints, and the two-tiered iconostasis, created simultaneously with the church, was adorned with golden carvings on a blue background.

Currently, the Alexius gate church is in a semi-ruined state. After losing its dome, it has lost all external signs of a cult building and now resembles an ordinary residential structure.