I have heard that cat urine, (smell) can not be removed if it gets into the walls or cement floor.  

On future jobs, I plan on just getting a 5 gallon bucket, filling it with some cement, putting a 2X4 in it and mounting a motion sensor or 2, the keypad and having the base unit somewhere in the house.  

. $2000 to dig up & replace the old pipes just to remove the cement like sludge. 

Houses built on cement work well with ceramic. 

(Can be a lot more if they are fully cement) Best of Luck 

Hi Eli,Although some people will just tell their contractor to use "The cheapest" or what is "Cheapest at Home Depot" or spec nothing and let the contractor pick out what he wants.It's best to pick your items using industry standard grading language (for lumber, cement slump, and etc...), or by manufacturer and part number (for paint, faucets, water closets, and etc..).Then work that language into the bid request (and manually verify it is being used on the site vs cheaper knockoffs).Kitchen faucets and shower mixing valves, for instance can vary widely in construction materials, service life, ease of installation (installer time), and ease of service once in service.Also, some manufactures will have grades for items, such as builder, multifamily, hospitality, hospital, homeowner, etc... 

THE light switch that turned on the light to the bathroom, located inside the shower...Redoing the landscaping in my current house I found beer cans as the frame for the cement edging.

A tenant had lived in the building for several years a 1st floor unit,, she had bad accident.. she loved living there, the family hired a contractor to put in everything she needed to assist in her daily living,, including a cement ramp to enter and exit the building... she was disabled, wheelchair bound, yet able to transfer and mentally able to act on her own behalf, and was also able to have a dog, due to companion needs.. 

If a rental or a flip you need to know what other bathrooms look like in the area as to finishes and quality expected.Example it has an older insert tub.You want to rent out.You find out that as long as the old tub and shower is clean tenants will pay 800.With a new tub and shower they will pay 820 a month.Putting in new say costs 1,500 for example.It will take you a 20 a month 75 months (over 6 years) to recover your money.So your answer depends on what you are doing with the property.Not just for the mold but the fixtures,valves,toilet,and supply lines for the sink and toilet etc.If you get a contractor to fix this they will charge a mint.If you get a mask and take it out and just put cement board up you should be fine.You need to make sure exhaust fan works,is proper size and suction rate for that size of the bathroom,and is properly vented to the outside of the property.Make sure roof is properly vented as that could cause sweating and mold problems.If you look into the attic and see mold on the underlayment of the roof boards then you either have a roof leak or a breathing problem.The roof vents for air going in and out (cycling) could be too small ,in wrong location,or too close together.Hard to say without being there.No legal advice.

. :)Having said that, what I am asking for help was those petty and unreasonable demands (~30%), like the paint peel, hole in the vanity sink, uneven steps between the utility room into the basement - it was uneven because there were tiles in the basement and it was just cement flooring in the utility room.