Two blocks from Retiro Park, this hotel, Spain's most famous, has been busy planning for upgrades thanks to its new affiliation with Mandarin Oriental, whose deep pockets and tasteful and talented team are a perfect fit. Approximately $100 million will be pumped into the palatial building beginning in late 2017, but until then, low-key touchups are in store.
The project's highlights will include making way for a pool, gym and new spa in the garden, as well as additional guest rooms; the makeo...