Although projects may not have complete control over the public space that surrounds their building, at minimum, provide adequate signage that communicates smoking is prohibited 25 feet from the entrance. Signage can help deter people from standing outside of the door to smoke.
Yes. If local regulations are not as strict as LEED you must create a policy that complies with LEED standards (and communicate this policy to building users) to achieve this prerequisite. Exterior signage that communicates the policy is required so that all occupants, visitors, and passersby are made aware of the exterior smoking policy.
No—this is optional.
In building reuse situations where the project doesn't qualify for MRc1, the building weight or volume being reused can count toward MRc2: Construction Waste Management. MRc3: Materials Reuse, on the other hand, is not applicable in most cases—see that credit for specifics.
We have not seen official guidance on this, but the LEEDuser expert consensus is "no." Each element of a building should be accounted for in either MRc1.1 or MRc1.2 and cannot be used twice. If a floor slab is reused and contributes to MRc1.1, it can therefore not also contribute towards MRc1.2. Even if it is used as a finish floor, that is not the same thing as reusing non-structural flooring under MRc1.2.
The percentage of reused existing interior building non-structural elements is calculated by area, dividing the total reused interior non-structural elements by the total area of interior non-structural elements (including new elements from additions or replacements). A calculator is provided in the documentation toolkit to facilitate this.
There is no specific way to earn LEED credit for these features. In some cases (see below), credit may be possible under MRc2.
All existing envelope and structural building elements are included. The items you do not include are interior non-structural elements, windows and non-structural roofing. If you have structural elements of the building that are considered hazardous or are otherwise structurally unsound, these can also be excluded from the calculations.
Yes. According to LEED Interpretation #998, "The approach of designing rainwater storage for a 'normal' rainfall year and providing potable water as backup is acceptable."
LEED does not distinguish what characteristics make an irrigation system "temporary." However, teams have had success by installing irrigation systems with plans to disable them in some way, such as removing sprinkler heads, cutting up pipe, or causing some other severe, if not unalterable, damage to the system.