"one block away" is a correct and usable phrase in written English.
You can use it to describe the physical location of something relative to something else. For example: "The store is just one block away from my house."
On Columbia Street, one block away from the thriving galleries, many houses remain run-down.
They were supposed to demolish another tornado-damaged house one block away, on Cousteau Drive.
One block away, on Ditmars Boulevard, John Zito, a hardware store manager, was doing a brisk business.
She lived one block away, on 106th Street, and Grosvenor had long been a part of her life.
I remove my earplugs and hear the steady rise-and-fall swoosh of traffic one block away on Madison Street.
Stores are either one block away or several, depending on your position along the avenue.
One block away, Laura Howe makes elegant, deconstructed street wear on-site at Matrushka (No. 3822; 323-665-4513; www.matrushka.com).
Students rallied one block away from the governor's house in Old San Juan on May 13.
On that occasion, however, Coleman had pointed to a different place entirely — one block away from where we now stood.
The bay was one block away.
The Gallery Place/Chinatown Metrorail Station is one block away.
