It was thus necessary to find a mutually agreed upon alternative location, and at least three of the hostelries had to remain in the area of Saint Mark's Square. In addition, the hostelries and shops provided a steady flow of rental income to the procurators of Saint Mark de supra, the magistrates responsible for the public buildings around Saint Mark's Square. So there was the need to limit the disruption of the revenue by gradually relocating the activities as the building progressed and new space was required to continue. The lean-to bread shops and a portion of the Pellegrino hostelry adjoining the bell tower were demolished in early 1537. But rather than reutilizing the existing foundations, Sansovino built the library detached so as to make the bell tower a freestanding structure and transform Saint Mark's Square into a trapezoid. This was intended to give greater visual importance to the Church of Saint Mark located on the eastern side. Work was suspended following the Ottoman–Venetian War (1537–1540) due to lack of funding but resumed in 1543. The next year, 1544, the rest of the Pellegrino hostelry was torn down, followed by the Rizza. On 18 December 1545, the heavy masonry vault collapsed. In the subsequent enquiry, Sansovino claimed that workmen had prematurely removed the temporary wooden supports before the concrete had set and that a galley in the basin of Saint Mark, firing her cannon as a salute, had shaken the building. Nevertheless, the architect was sentenced to personally repay the cost of the damage, which took him 20 years. Further, his stipend was suspended until 1547. As a consequence of the collapse, the design was modified with a lighter wooden structure to support the roof. In the following years, the procurators increased funding by borrowing from trust funds, recovering unpaid rents, selling unprofitable holdings, and drawing upon the interest income from government bonds. Work proceeded rapidly thereafter. The Cavaletto hostelry was relocated in 1550. This was followed by the demolition of the Luna. By 1552, at least the seven bays in correspondence to the reading room, had been completed. The commemorative plaque in the adjacent vestibule, corresponding to the next three bays, bears the date of the Venetian year 1133 (i.e. 1554), an indication that the end of construction was already considered imminent. By then, fourteen bays had been constructed. However, owing to difficulties in finding a suitable alternative location,