This article can give you some very basic ideas:
http://en.wikipedia.org/wiki/Drill_down[
^].
Indeed, we often face the choice between the desire to see more at once and available place. But not only. The user has limited ability to observe too much data. At the same time, a sense of hierarchy, the sense of isolation of key information from detail is important by itself. After all, you already put contradictory requirement to what should be close to what. In fact 1) your "must stay next to each other" and "should be next" is not really motivated.
(Here is the example. You have pictures and captions. Why a capture should be close the corresponding image? Only because there are more then one picture. If one looks at the caption, this person should clearly see that this caption corresponds to the picture above, not the picture below, or visa versa. And yes, the distance between those elements is the best way to show this relationship; a caption should be distinctly and apparently closer to one picture than to all others. In your case, such controversy doesn't present.)The other reserve you have is to make each of the three sections (contacts, annexes and construction report) smaller. Look at two inner areas inside each of those sections: multiline and payment. Imagine you already managed to stick everything in those three sections and the section on screen. Would it be enough? I doubt it. It appears to the unarmed eye that multiline and payment areas can grow infinitely. Therefore, they should be scrollable controls, such as list views or grid views.
—SA