January 15th, 2020 
Prompt
Imagine that you could set a universal system boundary that defined the life span of all commercial buildings. What would that life span be (in years) and defend why you chose this length of time. From this week’s reading material (see attached below- chapter 2, pages 44-47, 55-70) and assignments you may see that a common definition is LCA software is a life span of 50 years.
Guidelines
Please post a brief (not more than 250 words) response to this discussion question.
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