Smart planning by the imports. They didn't impose costly requirements for expensive dealership buildings. The whole focus was to get the vehicles out to the buyers as quickly as possible. I remember the local Datsun dealer in Santa Monica having his fairly small showroom and service department for a long time, before he finally built a new facility in the late 90's I think. Owner was a guy named Peter West, and I interviewed him around 1971 for a report I was writing in a college business class I took.
Yep, don't be fancy, just move the tin. Bought my 72 Celica in late sumer 72 rom Toyota City, Glen Burnie, Maryland. A year earlier that site was an import car fixem garage. They may have sold Saabs or something on the side but I only remember A lot full of TRs and MGs, etc.
There are some in North Seattle that have the same basic architecture, and all have been refurbished or fully rebuilt for use and energy efficiency.