public Builder clearTilePosition() {
        if (tilePositionBuilder_ == null) {
          tilePosition_ = org.bwapi.proxy.messages.BasicTypes.TilePosition.getDefaultInstance();
          onChanged();
        } else {
          tilePositionBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000004);
        return this;
      }