This is the presumed site of Andrew Leithead shipyard, which operated between around 1850 to around 1852

The Leithead's shipbuilding on the Wear commenced closer to the sea at Low Street, Bishopwearmouth in 1827. There, Andrew would stay for 6 years until a later move to the North Sands through to 1844. From 1844 ships were built on the south bank of the Wear at Pallion, though there's plenty of contestation between the specific location with some sources referencing Arrow or Andrew working at Southwick.

The Leithead's were a border family from Eccles on the Scottish side. Arrow appears to be the son of James with Andrew appearing to be a cousin of sorts (best explained by Searlecanada - https://www.searlecanada.org/sunderland/sunderland068.html).

This site was occupied from either 1847 or 1850. Luke Crown references a Leithead shipyard in his work "Reflections of Southwick", and is likely this one however other sources point to Andrew still working at Pallion until 1850 when the partnership was dissolved. Here though, at least 4 ships were constructed for various merchants registered along the North East coast and at London.

Unfortunately it's not known what happened to Andrew thereafter. Census records indicate a possible change of occupation as a lawyer, but there was a fair few Leithead's knocking around Sunderland at the time. Therefore, we probably won't know his fate.