Say on upper floors is valid alimlerin cogunluguna gore, as the floors are within the boundaries of Safa and Marwah — upper floors are sunnet for elderly and families due to less crowding.
Yes, performing Say on the upper floors of the Mas'a (Say corridor) is valid according to the vast majority of contemporary scholars. The Saudi Arabian expansion of Mescid-i Haram added multiple levels to the Say corridor to accommodate the growing number of hacilar. These upper floors are constructed between the same two hills of Safa and Marwah, within the legitimate boundaries of the Say path.
The permissibility is based on the principle that what matters is walking between Safa and Marwah within their boundaries — the vertical elevation does not change the fundamental act. This is analogous to performing Tavaf on the upper floors of the Mataf, which is universally accepted. Major scholars and the Saudi fatwa committees have affirmed the validity of upper-floor Say.
Practically, the upper floors offer significant advantages: less crowding, smoother flow, better accessibility for wheelchair users, and a cooler environment. The green markers indicating where men should hasten their pace (raml) are present on all floors. The distance per lap is essentially the same regardless of floor level. For elderly hacilar, those with mobility challenges, or families with young children, the upper floors are strongly sunnet for a safer and more comfortable Say experience.
Source: Saudi Permanent Committee for Scholarly Research and Ifta (al-Lajnah al-Da'imah)