I just had a mid grey sky, no cloud movement and flat light. I think my second shot in particular would benefit from a long exposure with some patchy cloud movement (or a blue sky like yours with a red filter to make it go dark in a B&W). I know it is (or maybe was) the fashion but I do like high contrast architectural shots with dark skies and bright subjects.
You got some good detail in the second shot - it that the cover they put on it to stop cars from melting?