If, after approval of a general development plan, the applicant wishes to revise the timing schedule, or to vary the location or types of land uses, or to increase the density of dwelling units, if applicable, or to increase the floor area ratio of nonresidential uses, the plan may be revised or amended only upon an application by the developer approved by the approving authority except, however, that the developer may reduce the number of dwelling units, if applicable, of reduce the amount of nonresidential floor space by no more than 15% of the prior approved general development plan without requiring approval by the approving authority, except that there shall be no reduction in the level of improvements, off-tract contributions, participation in the housing program (other than developmental fees based upon the equalized assessed value of improvements to the property), or similar conditions set forth in the earlier plan approval unless and until there is a revised plan approved by the approving authority. A revision to the timing schedule shall be reviewed by the approving authority. Any delays in complying with the prior approved timing schedule that have been determined by the approving authority to have been caused by matters beyond the reasonable control of the developer shall result in an extension of all subsequent phases of the development by at least six months, unless more time is approved by the approving authority. Matters beyond the reasonable control of the developer shall include but not be limited to such things as delays in receiving governmental licenses and approvals where the developer made timely and complete submissions allowing for normal processing times, any lawsuits enjoining or delaying development from proceeding, strikes, war, national emergencies, or amended or new laws requiring new or amended applications for licensing or other governmental approvals and major national economic changes. Matters determined by the approving authority to have been within all or some control of the developer shall be judged on an individual basis;