Meaning

And you may think that these areas will expand to cope with increased commercial activity. In fact, the prediction is that they will cover one-fifth of the area that they do at present as we build upwards. the exception to this is shopping centers, which we predict will expand with more and more temperature controlled malls.

what do upwards and temperature controlled malls imply in this text?

What do these sentences mean?

So, you'd make the extra money back on it that it costs.

You get a bit more for your money because what we are offering is a discount on labor.