NOTE: all lines pass through NZ house & it's the only tall building with line of sight.
Convergence does appear earlier, but not all lines converge (e.g. the purple line is off). While those buildings would work, they would need to be high enough. In the absence of other suggestions, The NZ building seems the best candidate.
The problem is getting access...how do these guys do it?? Especially getting out of hours access (according to its website it's only open 9am-5.30pm)