I need effective perspective correction.

I I take architectural in Sony's .SR2 Raw format. One of my photos does not seem to be correctable in LR 3 - there are no horizontals.
I think it needs a 'Force parallel' plugin such in DxO Optics and the Altostorm one I use in CS2. Any suggestions?

So how good are LR's perspective controls at correcting both vertical and horizontal perspective? The below image is the original 17mm image corrected using LRs controls, Vertical +20, Horizontal +27, Rotate +.3, and Scale 87. The second image was shot at a much further distance using 40mm focal length with no LR perspective correction. Interestingly I obtained the best results (i.e. closest match to the 40mm image) using NO lens distortion correction. With Lens Distortion correction applied in the 17mm image, elongation is increased and the roof to the right slanted downward when all other lines were parallel. From past experience  I have found most images shot at extreme wide angle look more natural without applying lens distortion correction (i.e. barrel distortion), for this very reason.  I rarely use it and leave the default at 0% for all my lenses. I only apply it on images with visible distortion, which are very few.
17mm with LR corrections
40mm with NO LR corrections
The LR corrected 17mm image is virtually identical to the flat perspective 40mm image. Their is of course visible elongation in the light at the upper left and other areas of the 17mm image, but you're not going to be able to change that with PC2 or C1 either! If you would like to try the below picture is a fully uncorrected image exported outof LR with the same size and settings as the above pictures:
Original 17mm image LR Export without corrections

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