Well perhaps you can run a cord or cable from your apartment to the attic. Beware however attics do not generally make the best growrooms, due to their huge temperature ranges. In the summer they get extremely hot, and in the winter very very cold. As an old heating/cooling guy, I can tell you I've spent a lot of hours in attics, and during the summer the only time I would go up there is EARLY in the morning. I've seen temps of 140F up there, and in the winter the water would freeze.

Good Luck