This is a residential district to provide for a slightly higher population density but with basic regulations similar to the “R-1” District. The principal use of land is for single-family dwellings, two-family dwellings, one-family row dwelling (party wall) with not more than two dwellings in a row or building and related recreational, religious and educational facilities normally required to provide a balanced and attractive residential area. Internal stability, attractiveness, order and efficiency are encouraged by providing for adequate light, air and open space for dwellings and related facilities and through consideration of the proper functional relationship of the different uses.