This chapter discusses Baltic (mostly Lithuanian) mass housing estates as winners of Soviet urban planning and housing competitions; the role of the architect in the field of standardised design; and Western architectural influences in Soviet Baltic housing estate design. In the field of industrialised and standardised housing construction, the role of architects and one-off design is of special interest, because industrialisation and standardisation in Soviet mass housing brought tension between planners of standardised large housing estates and master architects who drew up unique designs for public buildings. Despite the Communist Party declaring in 1955 the importance of mass housing, the Soviet Union's most prestigious state award-the Lenin Prize-was only ever conferred upon one model site: the Lazdynai large housing estate in Vilnius, Lithuania, in 1974. This chapter thus focuses on the involvement and experimentation of Baltic architects in the planning of standardised housing estates; on professional acknowledgment and on the fulfilment of ideological requirements. Keywords Microrayon Á Lazdynai Á Mass housing Á Baltic modernism 4.1 Introduction Reflecting the current interest in regional differences in large processes and phenomena, peripheral histories open up the possibility of seeing other dimensions, local variations and regional adaptations, and are able to change the established narrative frames. Comparative research in postwar mass housing has shed new light on uniformity and standardisation processes by adopting a more focused approach towards regional differences in the former Socialist countries, especially in the areas of East-West technological relations, the appropriation and rejection of Soviet directives, and the importance of local expertise (Kalm and Ruudi 2005;