The project title is Green Retrofit building in hong kong. One of project objectives is Green Retrofit Technology in hong kong. You need to focus on the objective. contents in the essay 1. Literature review
2. research methodology, such as, literature reviews(This is not the same as the one above, you should tell how to use it, please see example in attached file pic1 ), interviews, case study , field study and so on. You may use 2 methodologies.
3. research gaps(try to find it, it is not necessary)
There are 3 articles that you can use for sources, you also can find other relative journal. thanks for your time