Cabot owns an apartment building that had a fire. He paid $$5,000$ for smoke remediation after the fire. The repairs to the buiding cost $$12,000$ and the roof needed to be replaced for a cost of $$21,000.$ Insurance reimbursed him $$18,000$ for the roof, $$10,000$ for the repairs and $$5,000$ for the smoke remediation. How much did Cabot's basis increase$/$decrease as a result of the fire?

Decrease of $$33,000.$

Decrease of $$5,000.$

Increase of $$5,000.$

Increase of $$38,000.$