Garden + Terrace   You barely notice you're in the heart of a busy city when you're on Freesia's sixth floor terrace filled with garden plots. No other downtown building offers you this kind of gardening sanctuary. For those with a green thumb, there are 60 personal plots available. Have the luxury of growing your own vegetation: ripe tomatoes, fragrant basil, fresh strawberries - or freesia, perhaps? And with the plots, you also have the convenience of lockers to store your gloves, picks and shovels. Just off the garden area is a welcoming garden room. Here you can share stories with your fellow green thumbs, sit for a cool drink, join in a game of cards or relax with the daily paper or gardening periodical. And for those of you with a cat or dog, there's a pet shower on the terrace to keep roommates smelling fresh as a daisy.       © 2004 Magellen Developments (20/20) Inc. All rights reserved.