"One moment," Severus said as Weasley headed for the entrance. He cast a faint Muggle repelling charm over the yard. It wouldn't deter those determined to get in but it would give a better guarantee that the place would be empty if they wanted to use it in the future. he could have used a stronger charm but he wanted to be cautious with the use of magic for the moment.
He tucked his wand away and joined Weasley. "I presume they will be easy to identify?" he asked as they emerged into the street and turned left. "There are a number of maps that would be useful. Bookshops often sell them." He paused then continued dryly, "Or they did forty years ago."
"Admittedly, I only have a small amount of wizarding money on me," he said dryly. "Which isn't terribly helpful without Gringotts being available to exchange it."