In my opinion, full correction of verticals is un-natural and not desirable, except if the picture is taken for purely technical purposes. In my eyes, your picture is perfectly fine.
Last time I tried, the top of the building looked like it was squashed; true correction involves both making verticals parallel, and a vertical stretching of the top of the building; done not in any random way but following rigorous geometric rules (changing from one projection to another). I've had satisfatory results using a panorama stitching software... for just one image, e.g. Hugin (free). Such software allows you to change from one rectilinear projection (the one of the exposure) to another.BTW: Trying to correct the lines in LR looked very awkward...
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