@Capefox - It's WordPress ... anything is possible! (*grin*)
First off, thanks for choosing Ground Floor as your theme. This question also serves as a reminder the theme needs to be reviewed and updated. That being the case I will start by suggesting you create a Child-Theme before attempting to edit, or have edits made, to the core Theme files.
See this article I wrote regarding Child-Themes for more details: http://wpfirstaid.com/2011/04/wordpress-child-themes/
IN this case, for the current version (1.8), you will need to have at least two of the template files modified to accomplish what you are looking to do, 'index.php' and 'single.php'. (Similar modifications may apply to 'page.php' as well, depending on the scope of the changes you want to make.)
The section of the code you are looking for is the block wrapped by the
div class="post-details" element. Simply cut and paste this block of code below ... um, well, somewhere further down the file; I would think at least past the line starting with
<?php the_content( you will have to decide the aesthetic placement yourself.
Please remember to makes back-ups first ... before making any modifications to the Theme files.