You might consider installing a gas fireplace where the furnace is, (you all ready have all the connections there) and use the baseboard heat for the rest of the house.

The units are large (2,200 sft) and feature custom kitchens and baths, granite tops, wet bars, fire places, and cathedral ceilings.

Most likely the chimney supported a number of fireplaces and you wouldn't have to go back with that.

Kindly help me with your wisdom.It’s a semi-detached 2 unit has a new boiler, new hot water heater, vinyl replacement windows, brand new exterior doors, completely renovated 1st floor- 1 bedroom unit - features a living room with a fireplace and granite in the kitchen, ducted for central A/C.The 2nd floor-2 bedroom unit has central A/C.There is W/D hook up in the basement, and also a W/D hook up for the upstairs unit (would need stacked small unit to fit into space).

gas fireplaces?

You also should factor in lawn maintenance and preventative updates to your fireplace, central air unit, and furnace.

It had a living room and entry from the left side of the porch and also a large addtion including a great room with fireplace and dining area that accessed the living room through a door in corner of kitchen.

Living room and entry to the left side of the porch and also a great room with fireplace and dining area reached via door in kitchen Gutted to studs, rewired, replumbed, new sewer line.

Hi Greg, thanks for the feed back, and yes you are right, now I'm  not a professional landlord, but I've had 2 other properties there one of which I still own one and I also didn't have any problems placing tenants, the principal of the high school there has been living in the one I currently own there for 2 years now, the work being done is pretty much a total remodel kitchen cabinets, bathrooms remodels,replace the sheetroock in one of the bedrooms re-texture the walls, get rid of a gas fireplace, new flooring, painting interior and exterior light fixtures and add a central heat and air and is a 1300 sf 3/2.The people who lived there were just not clean at all and they just didn't care for the property. 

Cover lighting in tray ceiling for dining room, coffered ceiling in living room, floor to ceiling tiled fireplace.