Understood what you are saying, but just to confirm, otherwise I will be utterly lost, is this the actual code you were running?
lookupSTREET=SASHELP.USM;
As this is refering to sashelp library, which by the way, can NOT be reassigned. So are you saying in your real code, you were using 2014 Tiger in a different library, meaning you real code will be using a different non-reserved libname to address that.
Other than that, the only thing I know is that if the city level match is failed , then the city will be left blank.
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