100 days of English (day 14)

Free topic
What is the oldest building of your city? When was it built?
Cabin of Peter the Great is the oldest building in Saint Petersburg. It was built of with wood by unknown builders. It was constructed only in only three days in May 1703.
It is believed that the date of its construction is the date of foundation the founding of Saint Petersburg.
Peter the First had lived there for 5 years from 1703 to 1708 during the summer time. Inside the cabin there are is an entrance hall, a bedroom, a living room, and a study.
There is a bronze tag on the right side of the entrance. Peter the Great's height of 2 meters 4 cm is written there. Now there it is a branch of the National Russian Art Museum, opened open to the public.

Great work! Just a few small mistakes, but it is still clear what you meant to say :)

100 days of English (day 14)

Free topic
What is the oldest building of/in your city? When was it built?
The Cabin of Peter the Great is the oldest building in Saint Petersburg. It was built of wood by unknown builders. It was constructed [only] in only three days in May 1703.
It is believed that the date of its construction is the date of foundation of Saint Petersburg.
Peter the First had lived there for 5 years from 1703 to 1708 during the summer time. Inside the cabin there are is an entrance hall, a bedroom, a living room, and a study.
There is a bronze tag on the right-hand side of the entrance. Peter the Great's height of 2 meters 4 cm is written there. Now there is a branch of the National Russian Art Museum, opened to the public.     or  Now there is a branch of the National Russian Art Museum, has opened to the public

I think the oldest building in London is part of the Roman city wall, dating from the first century AD.  If this does not count as a complete building, then the 'White Tower', the central part of the Tower of London, dates from the late 11th century.

Free topic
What is the oldest building of your city? When was it built?
Cabin of Peter the Great is the oldest building in Saint Petersburg. It was built of wood by unknown builders. It was constructed only in three days in May 1703.
It is believed that the date of its construction is the date of foundation of Saint Petersburg.
Peter the First had lived there for 5 years from 1703 to 1708 during the summer time. Inside the cabin there are an entrance hall, a bedroom, a living room, and a study.
There is a bronze tag on the right side of the entrance. Peter the Great's height of 2 meters 4 cm is written there. Now there is a branch of the National Russian Art Museum, opened to the public.