How many windows do you estimate exist in Tehran?

To estimate the number of windows in Tehran, I would first clarify the scope: are we counting windows in all structures, or focusing on residential buildings? Assuming we focus on residential buildings, I would need data on the number of households in Tehran. I would then estimate the average number of windows per household. For example, if Tehran has approximately 2.5 million households (derived from a population of 9 million and an average household size of 3.5), and assuming an average of 10 windows per residence, this would yield an estimate of 25 million windows. This is a preliminary estimate, and I would refine it by considering factors like the proportion of apartments versus houses, and the average size of residential units.