One thing that should be emphasised is that the concrete lintel will not last forever
Well it probably would except in certain circumstances when it definitely wouldn't. We now have no tower blocks remaining from the 1960s because with the type of concrete used in that era where it contained steel reinforcement the process of carbonation caused the concrete to become porous and water got to the steel which rusted and expanded and cracked the concrete....
I'm sure it will have been fully checked and there are means to chemically analyse for carbonation if steel is suspected to be present but it would be nice to know it had been. External clues are spalling, patches of discoloration and particularly orange colouring. Any photos? ;)
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