Limits the amount of time to submit supporting documentation for major capital improvements

This bill requires landlords to submit all required paperwork for major capital improvements - such as building-wide heating, plumbing, or roofing upgrades - within 120 days of completion. If documentation is not submitted by this deadline, landlords cannot receive rent increases tied to those improvements. It directly affects property owners seeking to pass costs of significant building upgrades to tenants through regulated rent increases. The rule applies to all major capital improvements approved after the bill's effective date, with no exceptions for late submissions.