Hi LEEDuser community,

I have read some old posts regarding this issue, but I still want to double check with you guys. I hope you don´t mind. So, the way I see it (correct me if I´m wrong), there are two options in order to comply with this pre-requesite:

A) Comply with BOTH mandatory provisions and prescriptive requirements.
B) Comply with mandatory provisions AND perform a simulation following ECB method in section 11 of ASHRAE Standard 90.1

Now, if that is the case, I´m wondering if my project team should take on a project overseas which aims to obtain LEED CI certification. First of all, the potential tenant is moving to the 5th floor of a builing that does not comply with ASHRAE 90.1 mandatory provisions. I can tell this right off the bat becuase, for instance, air leakage for fenestration and doors has not been determined by an accredited organization such as NFRC [5.4.3.2 mandatory provision - ASHRAE 90.1]. (I even would dare to say that the cfm/ft2 is a bit above the minimum established in some cases)

On the other hand, I read in old posts as well as in the LEED2009 ID + C reference guide(page 139, under "less stringent local code") that since an issue like the one mentioned before is not in the scope of work of the tenant, then s/he is not required to comply with it. Nevertheless, when I see section 11.1.4 of ASHRAE standard 90.1, it basically says that compliance with section 11(ECB method) will be achieved if mandatory provisions are met.

In conclusion, the whole thing seems like a catch-22 to me. However, if that is not the case, how should we proceed?

- What is the "minimum level of energy efficiency for the space systems" that is being referred to in LEED2009 ID + C reference guide(page 139, under "less stringent local code")?

- For this particular project, the HVAC terminal units are in the scope of work of the tenant. So, does it mean that we will comply with this entire pre-requesite as long as we comply with the minimun efficiency requirements in Tables 6.81.A-G (assuming the reduction of 10% lighting power density and the installation of energy star products can be taken care of) ?

-How should we go about doing the simulation? if one is still required? Should we model the whole building as it is? Any tactics, tips, procedures, etc to isolate the tenant space for simulation purposes? what would the baseline building be?

> I know this was a long post, so thank you for the time you spent reading it! :)
> And, thank you in advance for any replies!