Tehran Housing Investment Company (public stock) started working in 1373 with the nature of a branch and the center of Tehran city. This company started its activity with Pamchal residential tower by covering the cities of Tehran, Karaj and Qazvin. Subsequently, on 10/02/2013, it was registered with the Tehran Companies and Non-Commercial Institutions Registration Office under number 269170 and continued its activities as an independent company. Tehran company was converted from a private stock to a public one on 05/29/2013 and was admitted to the Iran Stock Exchange on 06/16/2013 under the symbol of Satran. The field of activity of the mass production company is the construction of residential, commercial and office units in the form of diversification (luxury, medium and cheap construction) inside and outside the country. The company's strategies include market development and partnership creation, excellence in speed and quality, synchronization with new technologies and green construction. The main customers of the company include the depositors of Maskan Bank savings fund, investors, mass buyers and other natural and legal persons. The most important reason for choosing and buying the company's production units from customers can be mentioned the company's brand, construction quality, compliance with building standards and meeting the needs of customers in different social levels and classes (prosperous, middle and poor).