Subject to:  DD and financing, 3 day offer.  

Nothing a "subject to" enthusiast could think up? 

I am not an expert on the spanish tax system but I am reading upon it - It appears that your worldwide assets(Properties in the US) would be subject to Spain's 'Wealth Tax'.Spain is a great place to live...but their tax system is killer

The reason I’m pointing this out is to distinguish my post here from most of my other posts where I have specific expertise, knowledge and experience in the subject matter.  

Serious punishments.With all of that, Subject To is legal.

Not going to kill it on the rental income, but if you sell it subject to, there is a lot of equity.

Regardless you are supposed to always register your rental unit with the town annually, and be subject to their rent control inflation numbers.

LLC-A deducts the 10% management fee, while LLC-B reports it as active income, subject to self-employment tax but eligible for tax-efficient salary and distribution strategies.Ensure the setup has a clear business purpose, reasonable compensation, and documented management services to avoid IRS scrutiny.

Where / How can I learn what neighborhoods in Syracuse and the surrounding neighborhoods would fall into those (subjective) categories?

You would only pay taxes on all passive investments in a traditional SDIRA at distribution, unless you have a mortgage, then the portion of the income derived because of the mortgage will be subject to UDFI (unrelated debt finance income) which will trigger UBIT (unrelated business income tax).