Security Industry Association and Bond Market Association merged. Each had space in separate buildings.

Neither had room for the combined operation.

Merged entity also desired a rebranding and combining of cultures.

Sublet both offices at no net cost to SIFMA. Leased space in a new trophy building for less money than the former two leases, plus room for growth. Sublet growth space with several months  of taking occupancy.

Leasing space next to larger, growing companies make disposing of extra space  much more likely, less  cost, etc. Merging entities  and rebranding may support moving and may result in savings.