Herman Thomas Karsten architectural masterpiece becomes objects of cultural heritage that must be appreciated, it covers town planning and architectural design. On progress, Karsten's masterpiece hasn't changed much as a result of globalization that hits Semarang city; his masterpiece is considered well, valued by the society, it is possibly because of the conceptual approach that prioritizes and blends the local aspects of wealth. Collecting data including literature study, synchronic and diachronic method, will produce a red thread ideology that influences Karsten's way of thinking. History shows, the architectural work that survives is that have the local aspect in the concept of planning. Through the literature review of the Theory of the City and Local Aspects, and by taking the case on the cities of Karsten design, there will be a relation between the Local Aspect and the Concept of Town Planning by Karsten. Case Study in Semarang city, which is also the best or the most completed masterpiece of Karsten, becomes a reference that corresponds to the literature study, so we get the scope of the local aspect that consists of Place, People and Period always related with cultural, social and economic aspect, and all of these have correlation with the town planning and architectural work of Karsten.