&nbsp;This paper aims to discusses a history of modern buildings along Midosuji Boulevard in relation to its urban background. Midosuji is the symbol street in Osaka, and regarded very important for revitalization of Osaka City.<br>&nbsp;Midosuji is a national road, about 4 km long and about 44m wide. It's passes through the central area of Osaka from JR Osaka station to Nankai Namba station. Midosuji was planned in the first urban planning of Osaka City in 1920's, and specified as the first grade road in the plan. The construction was started in 1926, and completed in 1937.<br>&nbsp;This paper deals with the about 1km long of 4km of Midosuji, which is regarded to represent the image of Midosuji best. In this area, 50 buildings were built between 1920 and 1970, from the construction of the street to the beginning of the control about its townscape preservation by Osaka City.<br>&nbsp;The history can be divided into 3 periods from the viewpoints of architectural characteristics, number and arrangement of the buildings.<br><br>&nbsp;1) 1920-1945<br>&nbsp;In the 1st period, the construction of buildings were limited because of the influence of the war. 12 buildings were built mainly in 2 zones, Yodoyabashi area (north side) and Hommachi area (south side). Yodoyabashi area consists mainly of financial company buildings like bank and insurance companies, designed in the classical style, on the other hand Hommachi area consists of commercial company buildings, designed in popular style like Spanish. Its tendency stems from the history and its characteristic of the land which was developed in the early modern (Toyotomi and Edo) period as Semba town.<br>&nbsp;2) 1945-1955<br>&nbsp;In the 2nd period which corresponds to the post-war reconstruction, 10 of 12 buildings were built on the east side of Midosuji, and 9 were bank buildings. Many buildings had granite wall, and emphasized vertical line as the transformation from classicism to modernism. The east side arrangement stems from a difference of lots on the blocks. East side lots were easier to acquire than the west, because the west side lots were too subdivided historically to get in a short period. And banks could build their own buildings preceding other types of company by the then government's finance policies.<br>&nbsp;3) 1955-1970<br>&nbsp;In the 3rd period, 26 buildings were built on all blocks along Midosuji in the high economic growth. They were planned in the full size of the then architectural restriction, growing demand for utilization of the city center. Consequently, Midosuji had possessed the townscape with completed wall line and skyline. By the industrialization of building construction, curtain-wall system appeared on the wall of 8 buildings, on the other hand old construction of tile wall was still used for 10 buildings.

This paper describes the outline of 'Living Architecture Museum Project' by Osaka City. This project is aimed at generating and informing the urban attraction by regeneration and use of architecture in the city. It consists of 3 projects starting from 2013 for 3 years. (1) Selection: Osaka City selects 50 buildings as 'Osaka Selection' according to the own concept 'Living Architecture'. (2) Regeneration: It subsidizes the restoration of the selection. (3) Promotion of Use: The Open House event which has been held in Europe is held in Osaka, and 55 buildings were opened and 77 programs were given in 2014.

本研究は大阪駅の南側に位置する約6haの計画地に、大阪駅前第１ビルから第４ビルまでの4棟の高層ビルを建設した大阪駅前市街地改造事業を対象に、1961年から20年以上に渡った事業の変遷を整理し、各計画段階で目指された空間像がどのように変容していったかを明らかにするものである。結論としては、当初は「類型の反復という美学」に基づく統一性の高い計画であったが、事業過程で高層化が重ねられ、仕上げも変更されるなど、低層部の当初方針は堅持されたものの、高層部の統一性は失われた。また当初の計画にはなかった広場的空間が変更によって加えられ、その重要性が増していった。そして低層部屋上への公開空地の設置などによって、階による明確な歩車分離という当初の方針が損なわれたといったことが明らかとなった。

戦後の復興期から高度成長期にかけて日本の都市部に建てられた建築(戦後建築)の活用による都市再生を推進するため、大阪の都市部を事例として、 (1)密集市街地に建つ小中規模ビル (2)大通りに面して建つ大規模ビル (3)駅前の再開発ビルの3つのパターンについて調査を行い、これまで着目されることのなかったそれぞれの建築的な特徴を明らかにした。