It seems like you guys are up to your eyeballs in debt already, so buying the office would be the LAST thing I'd recommend.
You didn't mention why you'd need it, but purchasing locks you in even when your business needs/size change. And as mentioned, most things that seem too good to be true are not true.
Pay off your loans, then start chipping away at your house. Be frugal where you can, lower your annual expenses, etc.
For the dental bills, try putting them on new credit cards that have a huge sign-up bonus. If you fly Southwest, spend $2000 in the first few months and get points worth about $800, though there's a $99 annual fee. Be sure to cancel the card after you get the points.
Or ask your dentist if there's a discount if you pay in cash up front.