They Can Certainly Build Temporary Civilian Infrastructure.

https://news.sky.com/story/israel-gaza-latest-us-steps-up-pressure-on-israel-with-visa-ban-as-un-tells-netanyahu-military-operation-has-to-stop-12978800?postid=6906439#liveblog-body

They're simply choosing to build in places to ensure the maximum number of Palestinian civilians are killed.