Recently, PM suddenly told me that this property needs "lead testing".My PM is not aware of this I already have 2-year lead certificate from the previous onwer AND assigned an inspector for lead inspection for me.

It sounds like you are mashing a lot of different things together here.It does not matter at all if you have an LLC, or if you, or your wife is the owner - it doesn't change any of the tax positioning in the slightest.The test to be a qualified Real Estate Professional is at least 750 hours in real property trades or businesses AND  over 50% of your professional time. 

I had about the same results when I placed 20-30 calls per day, and the quality of the leads were similar: every day I would speak with 5-10 individuals and get one or two seller saying they are open to the idea of selling their house, but they would not accept anything less than the full retail value (often 125% of Zillow estimated value).

I generally agree that homes in Cleveland should be tested for lead.

“Few, if any lenders are going to accept this secondary lien position,” real estate agent Then said, so the tax-lien associated with the HERO improvements will have to be paid off, in most cases, at the time a sale closes or the mortgage is refinanced.The question becomes, who will pay it?

It should have been 5-10 days long starting when you accepted their earnest money.

Apologies for how long it is 😂Background - I have put a back up offer which looks like it will be accepted when the current buyer doesn’t meet the negotiated timeline  to close on a deal which was 2 small single family’s 2bd / 1bth recently fully renovated being sold together on a parcel.

It's a great example of how landlords are duped into accepting bad tenants.Define some standards, then stick to them.

I'd look for signs of arcing around those outlets.Other things I look for are how is the foundation, cracks in the walls (assuming lath and plaster), condition of the mechanicals, depending on what the house is built on, I may get a radon test done for the air and water (near me there is a lot of ledge, so radon is an issue in most homes). 

That said, do ask yourself before signing on the bottom line: if this tax strategy fails the IRS scrutiny test - what happens then?