Load custom field link as a Modal Popup

What plugin/module/ect would you recommend to solve this:

I'm building a Real Estate website. On many of the property listings, we need to include the property map from mapright.com.
My current setup:
An IFrame is in a Custom Field (Editor type) for the article. Then, that field is set to display in my Template's default.php file.
The Problem: This is AWEFUL as it loads SLOW and takes up a lot of visual space on the page. Plus, I just hate iframes in general.
Here's an example of the page as it currently is (ignore huge gallery at top; I'm working on that too): brokenarrow.cloudaccess.host/index.php/p...ur-dream-home-creede

What I want to happen:
Then link is included in cCustom Field (any tyep) for the article.
Then, when a link is present, a button appears on the page (included as either a module, or in the Template's default.php file - either is fine)
When the button is pressed, the link opens the page into a popup. I don't want to load the content until the popup is clicked. This would be the link/page that would open:
mapright.com/ranching/maps/022bb7e590152...af94088c064a74/embed


I feel like you have something that would do this, but am not sure which plugin/module/etc. What do you suggest?

Okay, as a followup question:
I'd like to call the custom field link of the displayed article from within a module that appears on that page.


For example, if the Custom Field "mapright-link" has content, then can Modals display that map Link as a popup from a module position on that page (rather from within the article content)

Is this possible?