the micro sociological theory which focused urbanism urban lifestyle more than structure was developed by?

It was Georg Simmel (1858-1918) who developed the theory of focused urbanism.

Explanation:

Simmel drew attention to the urban experience in his sociological theories, concentrating on urbanism or life within the city rather than the structural development or evolution of the urban area itself over time.  He focused more on the social psychology of city dwellers and how they are different than rural dwellers in the essay called "The Metropolis and Mental Life." Simmel believed that the sensory experience in a city makes a city dweller unique because of the stimuli -- there are more people and sites and sounds that sharpen our senses and make us more rational or calculating than those who live in the country. We think with our heads and we are more detached or reserved as a function of living in the greater population density of cities where there is more economic differentiation and people dedicated to different kinds of careers and trades.