I'm Anne. I've been preparing taxes for 27 years and I'll be happy to help you.
Unfortunately, there's not alot of detailed information in your question, so I can only give you generalities.
The $75000 gain from the sale of the rental property can not be offset by the new rental home that you built. I know that years ago you could "roll" your gain from one rental property to another as long as the new property cost more than the one you sold. That law is no longer valid, so the full $75000 gain will be a part of you AGI and your MAGI
However, your business loss will ultimately be netted against the $75000 gain on the front page of your 1040, so this will lower your AGI and MAGI.
I hope this answer helps you
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