I am working in an office where there is no room to pray. Even the walls are in glass so if you pray everybody will see you. The only solution for me to pray on time was to do it in the lavatories! Knowing that they are clean, the floor is clean, and the WCs are closed with doors. I only finish working after 7 or 8 pm so it would be really late to pray all the prayers at one time. However with my new solution, I pray on time and I am not scared that my boss finds out about me because I would be coming out of the lavatories. Tell me if what I am doing is correct.

Praise be to Allah, the Lord of the World; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

Initially, prayers are correct and do not need to be made up again if performed in any pure and clean place. The evidence for this is the Hadith reported by al-Bukhari and Muslim from Jabir Ibn Abdullah who narrated that the Prophet (Sallallahu Alaihi wa Sallam) said: "The earth was made a clean and pure place for me (to pray in)" .
So, if the ground of the place where you pray is pure clean and outside the toilet itself then there is no objection to your praying there since your aim is to perform the prayers in that fixed times.
We ask Allah to increase willingness to do the good and stick to the truth.
Allah knows best.