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Lanyon House is sheltered housing scheme managed by Plymouth Charity Trust. The House was built in 1869.
There are 15 flats.
Grade II listed. Link

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia 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