The units are little dated and tenant is responsible for gas heat in addition to water and electric.

For our numbers sake, we are going to negotiate/plan for 5% down so he at least feels we have some skin in the game.Now, the property. 2 bed/1 bath each side duplex built in 1957, he didn't say asking price but said (paraphrasing) "Zestimate says about $100k but you look at the market and see what you think"...his mentality has seemed pretty carefree about it all.

I have a few business I rent to (Art Gallery, Yoga studio, etc). 

We did not check to see what water, electric, etc. was each month and just took the prior owners' word for it being "cheap" to heat. 

Have the basement fixed, clean the walls with a bleach spray, put in a dehumidifier and open heat/cooling vents to air out the basement. if that doesn't completely stop it, drylok the walls.

I'd use the crime heat maps on Trulia to evaluate those.I hope that helps.

14 Unit Multi-Family - AZ3 Parcels6 BuildingsMostly new roofs100% Occupied and consistently at 100% over the last 25+ YearsAll Units 2 Bed / 1 BathIndividually Metered for ElectricComplex Water, Sewer and Trash / $800/Month Average4 Units have new a/c with heat pump10 Units have old A/CCurrent rent roles:1 Free Unit to Manager3 Units at $600/Month10 Units at $800/ MonthNeighborhood supports higher rents after new HVAC on older units and other improvementsAsking: $1,350,000

I'm living in a two family house and i was told that i had the attic comes to find out that someone was living in my attic.and i didn't know that someone was there is it illegal to have someone living in the attic and I'm paying the coast of heat and lights on me.

I'd like to know the best way to deal with heating in a single family home.

When I was on the top floor I notice one room only had a space heater for heat, which I thought did not qualify as a heat source.