Add punctuation: 1 A concrete existing space which had meant a lot to the student
A: 1. A concrete existing space which had meant a lot to the student

Add punctuation: A health club and a sauna are available on site
A: A health club and a sauna are available on site.

Add punctuation: Google Maps is the most widely used online mapping service in the world with more than 800000 sites using the Google Maps API and over 250 million active users on mobile devices alone
A:
Google Maps is the most widely used online mapping service in the world, with more than 800,000 sites using the Google Maps API and over 250 million active users on mobile devices alone.