Don't just do something cause someone on a REI forum said so, really understand what it is and what you want to do. 

If there is debt on the property you run into the debt-financed property issue which can cause the rent to be treated as UBIT and be subject to the trust tax rate which increases to 37% extremely fast.

The safest bet is to try to get a variance from Union City. though clever, your combined unit lease agreement would likely cause trouble if ever scrutinized by the Tenants or the municipality. 

Whether they are section 8 or market rate, a bad tenant can cause $10's of thousands of dollars of damage really quickly.  

Interest rates have been crushing, or at least compressing deals for them just like interest rates have been causing trouble for small investors like you and me.

This is causing a huge influx of people moving here for jobs.

If you treat all applicants as equally as possible and research fair housing, local landlord/tenant laws, and required state/local disclosures, you’ll have less chance of accidentally causing yourself problems.

This would cause the discussion to come up earlier in the Due Diligence process.  

These are only given to he ones that pay their rent on time and don't cause me any trouble.

It will help align your life goals and strengthen what you already have or expose any flags that might cause trouble if someone wants to divest...