You may recognize where my banner photo above comes from -- the photo of this restaurant building off Phan Xích Long Street in the Phú Nhuận District of Hồ Chí Minh City was taken a year ago when the building was fairly new.
I don't know if the infill was placed to keep out intruders for awhile until the building is rented again, or if the owner is preparing for a new tenant who wanted the openings blocked up. This was one of my favorite modernist buildings in Saigon, so I will be coming by regularly to see how what the results of this renovation will be.
Neighborhoods in HCMC are not static at this time -- they are constantly changing. You can walk along a lane one day, and then come back a couple of days later to find your favorite house demolished and a new house under construction.