Grenade...sorry to hear that bud. A similar thing happened out here which is how I ended up running our local on-road electric race. We use the parking lot in front of one of the LHSs for free but given the winter in Denver I doubt that is going to work out for you. However our previous indoor track may work for you, it would have for us had someone not messed it up. We used a warehouse on a military base. There was a shop running it and the base charged them rent but it was highly discounted because having a track available for military members to race at was good entertainment for the troops and covered under the Navy MWR (Moral, welfare, and recreation). You may be able to swing something under MWR for free if you don't have a shop and/or run it as non-profit if you have a base close enough.