I’m looking at purchasing a quadplex in New York City, where all four units are rent-controlled, with two units vacant and two still occupied by rent-controlled tenants.

I have just signed up for Launch Control and its getting frustrating. 

FNMA took total control over these entities.

That is done via placing the highest quality tenant possible, keeping issues to absolute minimum, keeping maintenance and service calls to minimum, because to make it work properties have to operate on cruise-control.

Effectively no, otherwise everyone would do it and there would be no rent controlled buildings.If the property becomes vacant there are scenarios you can remove it from rent control. 

While both involve shared spaces, the way ownership works is entirely different, and it can impact your rights, control, and future flexibility.Who Really Owns What?

But others investors with different risk tolerances, goals and financial situations invest in the platform.2) I feel directly owned properties are great because they give me maximum control and the ability to tweak them exactly how I want.

There are people out there who just cruise to places inventing problems so they can get discounts or free vacations after threatening low ratings.

This implies residential units can be built at lower costs and provide better return than building a single ADU.11) adding an ADU to SFH can make the SFH fall under rent control.

It sounds like you want checkbook control, @Katie Accashian  In this case, you need a special-purpose LLC.