Maybe I'm reading too much into that CoV concept for a mid-block walkway on the 1300-block between Government and Broad. There are many old news stories that make reference to residents of 1319 Government, so it seems like the kind of place that the CoV would have wanted to erase. But maybe it never actually happened? Maybe the old building was just completely gutted, as Jackerbie says?
Found the Building Permit records, all the old cards are scanned online. It was gutted in 1978 and renovated again in 1982. By 1995 the building was vacant, and it was demolished April 12, 1995. A new building was constructed a few months later in 1995. The new building was purpose built for the Gap by Farmer Construction.