With careful planning, you can develop a portfolio that consistently outpaces inflation and helps secure your financial future.I hope this helps.

Based on comparable listings recently sold I think closer to $650k there would be more interest.  

And at what nominal price compared to the $24mil they paid in 2019? 

There are a lot of good meetups for real estate investors in the area that would be good to grow your network and learn from others that are and have been in your shoes as a new investor, message me and I can share on some specific monthly meetups.Also sharing some multifamily data, this is Boston proper so it has an interesting trend compared to the rest of Massachusetts.

How does it compare to other options available to you?

However, the best way to get a feel for rental rates compared to values is to review/underwrite properties in the area - only after reviewing/underwriting many will you begin to see a pattern.

Leverage magnifies return. 3) The effort involved in adding an ADU is comparable or larger than a rehab associated with a BRRRR.

Ltrs are great because they keep a consistent tax base and particular voter in place.

Also, I believe the tax benefits are horrible compared to the states, but I'm not too sure.

You look for comparable sales for other distressed properties that are similar and nearby and also counter that with finished version comps so you can see what your perceived spread could be.