“The new mall would be phased in over a period of months and will require several parking adjustments, depending on the number of users.”
That sentence uses both “will” and “would.” Aside from being grammatically confusing, it refers to two different situations:
“Will” says something is going to happen. The parking adjustments WILL be made. “Would” is provisional; the mall MAY be built—but it may not. This sentence requires that both parts use either WILL or WOULD.