study found that the achievement of a specific IEQ credit did not substantially increase the satisfaction with the corresponding IEQ factor. In addition, the rating level and version of the certification had no impact on workplace satisfaction. There are some possible explanations. Many intervening factors in the time between design and occupancy can alter the existence or performance of the strategies that LEED awarded. IEQ certification metrics also face the challenges from substantial differences that characterize the modern workplace in terms of spatial needs, task requirements, users' characteristics, and disciplines of product design and marketing. Survey participants may also misinterpret the satisfaction with an IEQ parameter, or bias with personal attitudes. The daylight credit was updated in LEED v4 to include a simulation option for daylight analysis that uses spatial daylight autonomy (SDA) and annual sunlight exposure (ASE) metrics to evaluate daylight quality in LEED projects. SDA is a metric that measures the annual sufficiency of daylight levels in interior spaces and ASE describes the potential for visual discomfort by direct sunlight and glare. These metrics are approved by the Illuminating Engineering Society of North America (IES) and codified in the LM-83-12 standard. LEED recommends a minimum of 300 lux for at least 50% of total occupied hours of the year for at least 55% of the occupied floor area. The threshold recommended by LEED for ASE is that no more than 10% of regularly occupied floor area can be exposed to more than 1000 lux of direct sunlight for more than 250 hours per year. Additionally, LEED requires window shades to be closed when more than 2% of a space is subject to direct sunlight above 1000 lux. According to building scientist Christopher Reinhart, the direct sunlight requirement is a very stringent approach that can discourage good daylight design. Reinhart proposed the application of the direct sunlight criterion only in spaces that require stringent control of sunlight (e.g. desks, white boards, etc.). Innovation in design research Innovation in LEED architecture is linked with new designs and high-quality construction. One example is use of nanoparticle technology for consolidation and conservation effects in cultural heritage buildings. This practice began with the use of calcium hydroxide nano-particles in porous structures to improve mechanical strength. Titanium, silica, and aluminum-based compounds may also be used. Material technology and construction techniques could be among first issues to consider in building design. For the facade of