For example, if you have a rental property in a place where temperatures routinely go below freezing in the winter, does your lease include a requirement that the tenant needs to keep the furnace / heat on and at a minimum temperature?

I never feel uncomfortable with my offers because they are based on numbers and facts not feelings.

That 'lever' is pretty long, and it doesn't take a lot of pressure on the end of it to make life uncomfortable for me.  

It makes me uncomfortable...

Say I bought my property for 400k.I sell it for 500k which gives me a cap gain of 100k (after I minus the routine selling expenses such as broker's commission, title charges, escrow fees, recording fees, exchange fees, etc).Does my replacement property need to be equal or greater than 500k (sales price) or 100k (cap gain)?

Properties routinely stay on the market here for a year-plus.

If the seller constructed the units on your property, then I assume some sort of building plans would have to have been submitted to the appropriate authorities in the city, and in that case you should try to examine the building plans to see if the plans for connecting the sanitary waste were followed.One investor I know is considering adding video camera inspection of sewer lines to his normal routine pre-purchase inspections, so that he can identify in advance a big ticket problem for just a few hundred dollars up front.

Any wholesalers out there willing to share what there day-to-day routine looks like?

They did only give us the current LL info, so I think I will ask for the previous one and I will just call and talk to the tenants about my concerns and ask for further information that you guys stated, even though it is uncomfortable.

If this were me, I would HIRE a process server, I routinely get one for about 50 bucks..then you have an impartial person to sign the notice as served .