Perspective Warp Result is Mirrored

@ag-bc_5003 'that is not a solution: the end result using this method will vary depending on the size and shape of the box you initially draw around the text--try it.'

I've tried Persspective Warp many times and use it regularly. You may not like it, but that is the way perspective warp works. In layout you match the perspective of the existing planes, which in the case of your text is a single plane square to the viewer, then in warp you use the handles to drag those planes to the required perspective, which in your case is to match the building. By starting backwards with the layout matching the building, but then dragging the text, your text is going to shift in the mirrored way you show.
So, if using perspective warp, in layout select the area to be distorted, surrounding its current position which in the case of your text is flat to the viewer. Then in warp, drag it into the perspective required. 

It does indeed vary by the size of the box around the text, again that is expected. You are warping a selected plane.

With all that said, for the example you show, you don't  need perspective warp at all. It was designed where multiple planes need to be adjusted in relation to one another. A simple transform - distort, on a smart object, will do the job on the text as nicely demonstrated by Trevor

Dave