@Ezra Nugroho all 3 were clean and paint. 2 had new gas furnaces from last owner, 1 had central air. all 3 had off street parking. 

They are cheap and will save you from future leaks and clogs.

Gas prices coming down and rents also starting to come down pretty significantly here.  

And the time I spent writing the lease, screening the tenants myself, go over to the property if the kitchen sink is leaking?

house didn’t have any leak (as they say and as on disclosure form) house wasnt owned by professional investor, it’s owned by a couple who bought in 2017, completely fixed the rear unit and added 2 new bathroom in front, which they divorced around 2019/2020 based on my search, so I am somewhat thinking there not much to hide?  

I have a house planning to replace pipe in crawlspace with PEX but concerned about mice chewing through it and causing a major leak.

Duplex is all electric,no gas.

Gas heat access is better than electric for example if you have a choice. 

Roofs never start leaking on flat areas, its always penetration points or valleys.

Can you go to the utility companies, show them that you own the property and "ask" if the power, water, gas are on and if so under what name?