The portmap.rar file you have requested: Maps Levels Missions / Portal: John's Map - 150.25kb is not available. Perhaps try browsing all files for the game Portal and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Portal, visit Halflife2.filefront.com This is a portal map. John tried to remake of the first video demo map you seen in the portal video.