<font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 0pt;text-align:justify;line-height:normal;text-justify:inter-ideograph" class="MsoNormal"><span style="font-family:"Times New Roman","serif";font-size:12pt">Dear
colleagues:</span></p><font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 0pt;text-align:justify;line-height:normal;text-justify:inter-ideograph" class="MsoNormal"><span style="font-family:"Times New Roman","serif";font-size:12pt"> </span></p>
<font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 10pt;text-align:justify;text-justify:inter-ideograph" class="MsoNormal"><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt">We are processing a three-year study to create an
optimization framework for minimal building life cycle cost cooperating with
DOW Building Solution. We would like to invite you to participate in a survey
to understand the importance of life cycle optimization from a designer's point
of view. This survey is a significant input of the research. Your response
would be appreciated.</span></p><font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 10pt;text-align:justify;text-justify:inter-ideograph" class="MsoNormal"><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt">In total, it should take 5 minutes to complete the
questionnaire. The information participants provide will be maintained strictly
confidential. To fill out this survey, please click the link: </span></p><font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 10pt;text-align:justify;text-justify:inter-ideograph" class="MsoNormal"><a href="https://www.surveymonkey.com/s/BuildingDesignSurvey"><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt"><font color="#0000ff">https://www.surveymonkey.com/s/BuildingDesignSurvey</font></span></a><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt"></span></p>
<font size="3" face="Times New Roman">

</font><p style="margin:0in 0in 10pt;text-align:justify;text-justify:inter-ideograph" class="MsoNormal"><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt">Thank you very much.</span></p>
<div><font size="3"><font face="Times New Roman">

Guiyuan Han<span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt"></span></font></font></div><div><font size="3"><font face="Times New Roman"><span style="line-height:115%;font-family:"Times New Roman","serif";font-size:12pt">PSU Building Science Group</span></font></font></div>