Show some cherry picked comps and be specific on why the value should be lowered, making sure to site current condition if anything needs upgrades, etc.

I have only been investing for ~5 years myself, but current market conditions force even the best of them to adapt or die!

Stay informed about market trends and local real estate conditions, and consider diversifying your portfolio to spread risk.

Research the area's neighborhoods, local amenities, and property condition.

It's something that you can request as a condition of COE, and a good realtor working on your behalf would have known this.  

I realize there are a lot of variables at play during turnovers, such as:- What was the condition prior to tenant move-in and what is the condition after move-out?

Market conditions, tax breaks, property appreciation, investment goals, and personal circumstances can affect your decision.

I am not replying at all with regard to any local jurisdiction’s rules/regulations.As for statewide 1482, the rent control and other provisions do not apply in the conditions you have specified.  

The property currently has a boiler servicing three units with radiators, which is in good condition.

Here are a few negotiating tips to be successful: Have a good idea of local housing market conditions to determine if it’s a seller’s or buyer’s market.