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Morden College is a charity which has been providing residential care in Blackheath, south-east London, for over 300 years.
It was founded by philanthropist Sir John Morden in 1695 as a home for 'poor Merchants... and such as have lost their Estates by accidents, dangers and perils of the seas or by any other accidents ways or means in their honest endeavours to get their living by means of Merchandizing.'
Morden College was built (to a design sometimes attributed to Sir Christopher Wren, but largely carried out by Edward Strong, his master mason) on the north-east corner of the Wricklemarsh estate.
Grade I listed. Link
Wikipedia: Link

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

Almshouses are charitable housing provided to enable people (typically elderly people who can no longer work to earn enough to pay rent) to live in a particular community. They are often targeted at the poor of a locality, at those from certain forms of previous employment, or their widows, and are generally maintained by a charity or the trustees of a bequest.
Alms are, money or services donated to support the poor and indigent. Almshouses were established from the 10th century in Britain, to provide a place of residence for poor, old and distressed folk. The first recorded almshouse was founded in York by King Athelstan; the oldest still in existence is the Hospital of St. Cross in Winchester, dating to about 1132. In the Middle Ages, the majority of European hospitals functioned as almshouses.
An incomplete list of British Almshouses can be found at Link