Usually you are not able to do this if the home is zoned residential without going in front of the zoning board for a "use" variance.
I will tell you from experience that most ZB's will not allow any "commercial/medical use" in a residential zone. Plus you have to pay for the application, hire an attorney, architects, planners, engineers, and get a traffic impact study to present your case to the ZB. ( as John Sacktig said... all with information regarding traffic, parking, drainage, etc).
Best to get a property already zoned for medical use (you can find out where the zones are by visiting the zoning office and getting zoning maps).
You asked what a zoning was about a commercial property. It is very hard to take a residentail property and make a business office out of it. there are many things involved, traffic, parking, drainage, neighbors.. all kinds of things.
I know you are a fan of doing things on your own... but in this case you may jsut as well be out of your league. Give a call..
*Note: Asking questions on Trulia for localized items such as this.. you get answeres like below... "bots" like the NY person fhat has people answering things for her in her name just to get a lot of hits.. and someone from Connecticut coud not possibly have an idea.
Broker / Manager
Orange Key Realty
In this case the zoning officer knew right from the start that you would not meet the parking requirements since the lot is too small, thus helping you avoid going in front of the ZB for a variance and the associated costs.
Just curious is the home located in an area zoned for medical use or in a mixed use area or is it zoned residential?
Equity Capital Real Estate
(203) 280 3838