Guess me : A city you seek, a place to treasure So combine these things in equal measure: An original .............

Question

A city you seek, a place to treasure
So combine these things in equal measure:
An original transgression
A San Francisco store and
A product of a mine.

Answer 1

Singapore

An original transgression is a SIN.

There are plenty of stores in San Francisco, but the GAP is one that originated in that city.

The generic term for a product taken from a mine is an ORE.

SIN, GAP and ORE are all 3-letter words, so their "measure" is equal.