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At this point, you would have grounds to sue him for breach of contract for the loss of use of the amount of square footage that was taken. So you would be entitled to a retroactive reduction of 50% of the rent from the time of the loss up to now, then to a reduction in rent from this point forward until the end of the lease. You can also sue him for the increased usage for electrical service as he had no right to use "your" electricity to do his project.
Although a commercial landlord has no legal duty to mitigate his damages in the event of a breach, he also can't take away space from you while continuing to charge you full rent, in effect "double dipping" by being paid twice for the same area.
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...
Lost revenue is always questionable because you can't really prove that if you had the space, you would have earned $XXX a day or $YYY a day or $ZZZZ a day.. It is just too speculative and judge's won't award it. It is possible that even if you had the entire space, it would still sit empty if business was bad. So lost revenue...you can ask, but I wouldn't expect it.
However, you could argue that the reduction in space has so damaged your use as to make it valueless for you and therefore you should be let out of the lease retroactively from June on and receive a refund of any rent paid from that point on in addition to any electrical usage..
You are very welcome. Glad to help any time..
All the best to you and yours..
I don't see any "tricks" or questionable language in the proposed agreement, but I can't comment on the numbers as that is something you would have to do the math on to make sure they jive..