Update the Exemplary Performance under the v4 LEED-NC credit: LT Credit Reduced Parking Footprint to the following:
Case 1. Achieve a 40% parking reduction from the base ratios.
Case 2. Achieve a 60% parking reduction from the base ratios.

In Step 2, replace the last bullet with the following: Testing must be performed by an appropriately accredited professional, using the approved test methods. The accredited professional should determine the sampling time based on the test method, maximum allowable concentration, and expert judgment.

In Changes from LEED 2009, add a final bullet: There is no longer a 4-hour sampling time requirement in Option 2.

Step-by-step: remove the "All Projects" section and move these steps to Option 1 as Steps 4-7:

Remove the third bullet and associated text.

Replace first bullet with "Determine the required amount of continuous ventilation using the following ASHRAE 62.2 equation:"

Remove the “1 point per credit” language so that the sentence reads: "Each Regional Priority credit is worth an additional 1 point, and a total of 4 additional points may be earned by achieving Regional Priority credits."

Under Guidance, delete: "There are no substantive changes to the prerequisite requirements; refer to the LEED v4 reference guide, with the following additions:"

replace Behind the Intent, Beta Update text with the following:
The ASHRAE standards have been updated to the latest versions:
 ASHRAE 55-2010  ASHRAE 55-2017 (updated version)
o Major changes from 2010 include: clarifications to elevated air speed method, new requirement to calculate the change to thermal comfort resulting from direct solar radiation impacting occupants.
 ASHRAE Applications Handbook 2011 edition  ASHRAE Applications Handbook 2015 edition (updated version)
Option 2 is available for use through regional compliance pathways.

replace "There are no substantive changes to the credit requirements; refer to the LEED v4 reference guide, with the following addition:" with "Behind the Intent
Beta Update
The interior lighting credit has been overhauled to prioritize strategies identified by industry lighting experts as most critical and impactful for new construction LEED projects.
Lighting quality strategies for lamp life, direct overhead lighting, surface illuminance ratio have been removed.

Add the following language under Guidance:

"Behind the Intent
Beta Update
Specific criteria for the glazing characteristics have been added to address challenges with determining acceptable levels of clarity, frits, fibers, patterns, tints and to minimize conflicts with the Pilot Credit for Bird Collision Deterrence.
The view requirements were also revised to better differentiate criteria for view content from criteria for view access and to eliminate potentially redundant requirements.
The requirements for healthcare have been revised for clarity.