The correct classification can be determined only by examining all facts and circumstances.Agree with @Ashish Acharya that at least some of this trip is personal in nature. 

Depending on your volume of transactions and number of properties Excel can do a great job if you have a good system.I'll diverge from Ashish a bit and disagree that you have to have separate books for each property in order to qualify for the new 199A / QBI deduction. 

@Troy Ritter Troy, I disagree with many above.

Anyone out there in the tax arena disagree? 

But, I must disagree strongly against one property in one LLC, it definately does not shield you from liability if you lose personally in court, your assets can be at risk which includes all the LLC business interests you hold, there are many aspects that make this a bad idea that have been covered here by attorneys who were saying it's not necessary.....insurance is your line of defense and quality management is your first line of defense.If your partnership is really on a fair basis, it would be that rewards were equal to risks assumed.

The property was being sold by an heir and the buyer asked if there were any UST on the property and was told there were none.For the buyer/investor this was not his first rodeo and so he wrote in the contract that before settlement an examination of the property would be made by a professional and if any USTs were on the property, they would be removed by the seller before settlement.

There are numerous options that must be considered and many costly mistakes that need to be avoided.Dissolution of the business is one many forget.Other considerations include:DeathIncapacitationSpousesChildrenAnd, yes, you will disagree on the smallest issues.

Three years later, she still had the SOS pads in all corners and also squeezed them in around all plumbing pipe holes.We do thorough examination of the building and exclusion.

So the notes also get 3 out of 4 and stay totally passive (other than the purchase DD which takes place on both notes or holding)Those are my arguments, we can certainly agree to disagree.

Having said that on the matter of incentives in general I disagree with the majority of advice on this thread.