I have just started looking at properties and seen several early 1900's places (condos, duplexes, all on South side, in largely original condition) that are heated by radiators, but that have no radiators in the bedrooms. 

I'm guessing you have a boiler that sends hot water to the radiators and also heats the domestic water (sinks and showers)?

@Rachel Luoto cell towers potentially have issues with radiation that may scare some people away

Radiator also needs fixed. 

Hi,Are radiator keys universal or are there more than one size?

Currently it has oil furnace heated radiators, which by the looks of it is not functional. 3 questions:1 - Any thoughts on whether i should go with the streamlined product (35K max) or the standard?

The house is heated with gas, and they have radiators throughout the units.

This one is for those who fix and flip homes in Massachusetts or states that closely resemble MA in terms of temperature/climate.When fixing a property that has radiator heating and AC window units, do you guys always budget for a brad new HVAC system to be put in place?

@Michelle WilliamsWe started out in the basement of this property and talked about the typical things to look for when walking through:Electrical work, foundation leaks or cracks, piping, asbestos, gas meters, structural integrity (support columns, rafters) and heating (forced air water heater vs radiator boiler)The basement of this particular property (according to one of the tenants) was actually a beauty salon about 20 years ago, so there was still a toilet in place on one side of the room, as well as an additional entrance.Aaron mentioned that today gas companies prefer to have the meters on the outside of the unit for access, and since these were on the inside Peoples Gas would do the necessary work to route them outside the unit.We traversed through the back entrance to the top floor and walked through, noting the floors, kitchen area, bedrooms and closets, bathroom and living/dining areas.  

If it has a boiler with radiators, look closely at them to ensure they aren't leaking.