http://www.shutterstock.com/pic-99608288/stock-vector-large-detailed-modern-house-interior-cutaway-layered-grouped-eps.html
http://www.shutterstock.com/cat.mhtml?lang=ja&search_source=search_form&version=llv1&anyorall=all&safesearch=1&searchterm=%E5%AE%B6&search_group=&orient=&search_cat=&searchtermx=&photographer_name=&people_gender=&people_age=&people_ethnicity=&people_number=&commercial_ok=&color=&show_color_wheel=1
http://www.futta.net/photo-building/
http://www.sakai.zaq.ne.jp/camaky/
加工することも可能で沢山のイラストがありますが値段が高いです。