From the outside I can tell the roof is new (installed <6 months ago), the building needs to be painted (lots of peeling already), some window screens need to be replaced.

My hot buttons to draw attention away would be crown, fireplace with limestone, fancy light fixtures, upgraded cabinet doors with 30" uppers, stained concrete or laminate floors and stainless appliances and brushed nickel everywhere and two tone paint.

Seller allowed us to perform inspection(for information purpose only) and we discovered few issues(window not shutting down, paint peeled off in bathrooms, exhaust fans in both bathrooms not functioning).

.#3 - Others can correct me if I'm wrong, but my understanding is that the best way to deal with lead paint it containment meaning that you simply paint over it.

This is not a paint and carpet rehab, this is a serious amount of work for a professional crew.

I just want to update this post ...It took me two months to get the tenants out of the house, and only $4000 to change a few light fittings, make the pantry into a laundry, and paint interior, and lay new carpets.

Are you sure it's in the carpet and not the paint also?

Find out the lead paint regulations in your area to see how it complies. 

Just to paint a picture when the owner rents a unit, he tells the tenant if anything breaks, its on them.The code violations include 45 tree with the top 15ft dead, sofa on driveway for 2 weeks plus, foliage overgrown at back of property. 

If you look at 8 houses, and you are reviewing all at the end of the day, you can tell where one ends and the next begins,  We also make sure not to take too many pictures. 8 max of only the high ticket items, roof, windows, kitchen, electric panel, kitchen, baths, furnace, ac, front and back, andything unusual,  i dont want a picture with a hole in drywall that will cost 25.00 to fix, no pictures of carpet of paint, or things we will replace in every house.... always a couple photos for perspective.