No that is just for decoration. I don't think you can get in there even as a member.
nope
You can't. The quest includes climbing ABOVE the garage after you rescue the second spy. (see related question)
Rescue the third spy from the Rooftops above the Grease Monkey garage. You will need the Grapple Bowtie from the second spy. (see related questions)
The connection to the Rooftops on Spy Island is directly above the Grease Monkey garage on Balding Avenue. You will need the Grappling Bowtie from the 2nd rescued spy in order to reach the rooftops.
You can't. It is not one of the buildings entered. When you have rescued the 2nd spy, the Grappling Bowtie will let you climb above the garage and reach the Rooftops. (see related question)
The third spy is being held on the Rooftops above Balding Avenue. To get there, grapple up from the Grease Monkey Garage. (see the related question)
The "third spy" is being held in a greenhouse in a tall building on Balding Avenue. You can only get to the rooftops (above the Grease Monkey garage) when you have the Grappling Bowtie from the second rescued spy. (see the related question)
You don't : rescuing the Second spy gives you the Grapple Bowtie, which lets you reach the high Rooftops on Balding Avenue. Get the bowtie and climb above the Grease Monkey garage. (see related questions)
You are given the Ultra-vision Goggles by the third rescued spy, who is in a greenhouse above Balding Avenue. Once you have the Grapple Bowtie, you can climb the building above the Grease Monkey Garage and reach the Rooftops. (see related question)
You have rescued the "second spy" from Toupee Terrace (the windows are electrified), and you have the Grappling Bowtie. Now go to Balding Avenue and climb up at the Grease Monkey Garage to reach the Rooftops.
The greenhouse is atop the tallest building on Balding Avenue, and the third spy is being held captive there. You will need the grappling bowtie from the second spy in order to reach the rooftop above the Grease Monkey garage.(see the related question)On top of the highest building.
You have to rescue the three spies in order, because the first spy gives you the item to rescue the second spy, and the second spy gives you the item to rescue the third spy. The first spy is in the warehouse at the Docks, the second is in the electrified building on Toupee Terrace, and the third spy is in a greenhouse on the Rooftops above the Grease Monkey garage. (see related questions)