The spaces you are referring to are actually designated accessible seating spaces for disabled guests and their companions. These spaces are found in row 5 of many upper level sections.
The View Level seats down the line offer more concession options than the upper decks at many MLB stadiums. Though incredibly far from home plate, Section 313 is near men's and women's restrooms, the Landing Bar and ice cream -- not to mention it offers a great view of the skyline.
Though they are well protected from the sun, Rows 15 and above should be avoided if you have issues with steep stairs.
Seats on the 1B side of the field will have the best view of the skyline.