Good evening,
the amount of the offer seems very high to me; so the question arises as to what exactly you requested?
On the other hand, I am always skeptical when a lawyer - no offense to this wonderful profession - is supposed to review the entire offer including all attachments. He is proficient in his core business, the many paragraphs, including those in VOB and the Construction Code; no question. However, a construction contract consists - besides the actual contract - also of plans, the offer, the construction description, and not infrequently a list of additions.
Therefore, I would ask myself what qualification the lawyer brings, beyond his main business, to be able to assess a complete offer.
Rhenish greetings from on the road
Construction expert