The restoration and investigation of the Lavra architectural monuments were resumed by other architects in the late 1930s. The famous archeologist, architect and restorer P.D.Baranovsky (1892-1984) was a real devotee and a person of encyclopedic knowledge. In 1933, he saved St. Basil Cathedral from destruction. In 1993, the Kazan Cathedral in the Red Square was restored to his measurements and drawings In 1937, P.D. Baranovsky examined the top of the Church of the Holy Ghost, demolished a part of the vault in its attic and discovered remnants of the belfry which once served as the Monastery observation tower. P.D. Baranovsky's discovery was used for the Church restoration in the 1960s. To O.P. Baranovsky's drawings a model of the Church with the belfry was made. It revealed the original beauty of the monument.

P.D. Baranovsky also restored three windows of the ground floor of the southern Infirmary Chamber, the middle southern gable of the Church of SS Zosima and Savvaty, the merlons and loop-holes of the western fortress wall between the Cellarer and Carpenter Towers. In 1928, the Department On Art Affairs of the Moscow Region Executive Committee entrusted architect I.V. Trofimov to examine the state of the architectural monuments of the Trinity-St. Sergius Lavra. The damage certificates testified to the urgency of restoration. I.V. Trofimov worked out the General Plan of restoration for 1939-1943 with the explanatory note and the estimate for 15 objects. The General Plan of the Lavra restoration was based on the idea of the ensemble. The plan included, firstly, repairs, engineer and preventive works aiming at strengthening of separate parts of the constructions to escape crashes and, secondly, restoration in strict sense.

It was necessary to determine priorities of the objects to be restored. First of all, the artistic value and the state of the monuments were considered. On the basis of I.V. Trofimov's resolution on the condition of the Lavra monuments and the General Plan of restoration for 1939-1943 on February 1, 1940, there passed a direction of the Council of the People Commissars declaring the whole Lavra complex of the monuments within the fortress walls a museum-reserve. The 30-metre area around the external line of the ancient fortress was determined as a protected (forbidden for construction) zone. To fulfill the works the Government provided the sum of 6 000 000 rubles which was enormous for that time. The Museum organized a special building site to carry out repairs and restoration. In the course of thorough investigation the fortress walls and towers, Infirmary Chambers with the Church of SS Zosima and Savvaty Solovetsky, the Church of the Holy Ghost, the open gallery of the Refectory and the Tsar Palace were determined as the central objects of restoration.