Explanation
LEED BD+C: Multifamily Midrise is the appropriate rating system for residential buildings that are four to eight stories above grade1. Since the project scope includes 60% of the gross floor area, it meets the minimum program requirement of having at least 40% of the gross floor area certified2. The other rating systems are not suitable for this project because they either apply to different building types or heights23.
References:
LEED rating system selection guidance | U.S. Green Building Council2
LEED v4: Building Design + Construction Guide - U.S. Green Building Council3 LEED v4 Rating Systems | USGBC-LI1