What does the process of Retrofit generally involve?

The process of retrofit primarily involves upgrading existing buildings to improve their efficiency, sustainability, and overall performance. This can encompass a variety of improvements, such as enhancing energy efficiency through better insulation, installing energy-efficient windows and HVAC systems, and incorporating renewable energy sources like solar panels. The objective of retrofitting is to update and optimize older buildings while minimizing the environmental impact and extending their lifespan.

In contrast, the other options focus on actions that do not align with the concept of retrofitting. Building new structures from scratch entails creating entirely new buildings instead of enhancing existing ones. Demolishing outdated facilities involves tearing down structures rather than improving them. Designing architectural plans for new developments also centers on new construction rather than optimizing or retrofitting existing buildings. Thus, focusing on upgrades and enhancements clearly defines the retrofitting process as the correct answer.