Buildings with mix of zones

October 29, 2021

Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)

LEEDuser Basic Member

85 thumbs up

October 29, 2021

Dear All,

We are certifying a building that will include the following areas:

Two questions:

We cannot find guidance for the base ratios for parking spaces for museums in the LEED Reference Guide. We have already consulted the PCC Recommended Zoning Ordinance Provision (5^th edition) that provides guidance for different situations but do not indicate base ratios (please refer to the figure below). The question is: which figure shall we use as base ratio (average, 33^rd, 85^th) ? Weekday, Saturday or Sunday ? General Urban / Suburban or Dense Muilt-Use Urban ?

Can we use a mix of zones to calculate the applicable base ratio for LEED (in this specific case, a mix between base ratios using the convention center and the museum) ? The idea would be to calculate the number of parking spaces for the museum zones and the number of parking spaces for the convention center and consider that the base ratio for the building corresponds to the sum of each base ratio.

Regards,

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LEEDuser Basic Member

3 thumbs up

March 22, 2022 - 7:08 am

Hi Ricardo
What strategy did you end up adopting?

Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)

LEEDuser Basic Member

85 thumbs up

March 24, 2022 - 5:36 am

Hi Priscilla,

We've received the following guide from GBCI:

As mentioned in Step 6 of the Step by Step Guidance of the LEED v4 credit (which also applies to LEED v4.1), "If the project type does not fit any base ratio category or if the tenant is not yet known, select the best approximation and provide a narrative justifying this selection". Your team will understand the usage of the building the best, so it is up to your team to select a base ratio that best represents how the project will be used, make any adjustments to the base ratio if necessary, and then provide a narrative explaining to the review team how the base ratio for the project was determined. This narrative will then be reviewed based on its merit, and reasonable justifications are accepted.
as mentioned in Step 2 of the Step by Step Guidance, "For projects with multiple space types, calculate and separately track the base ratio for each use". So not only is your project allowed to do this, but should be doing so.

Hope that's help,

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