Outputting the sum of multiple fields into a new view that then gives a grand total
Probably the simplest way to do this via Views is to add the Computed Field module to your site, and build a new content type (maybe "summary"), and add a summary for each kind of property you'd want to add in the view, and then use the computed fields to calculate all the grand totals. Display the computed fields in a new view, and it should work fairly well.

However, that wouldn't be all that dynamic. There are probably ways to do this in views itself by adding groupings, relationships, and calculated fields, but you'll end up with a view that's fragile and a real pain to maintain via the UI. You might want to approach adding a views attachment, or a display after the view, or just use some plain old custom code to generate a block (or within a block if you use the PHP filter, but I would not recommend this approach).

Another possible solution (if it's simple feature set gives you what you'd need) is the Views Summarize module.