My local health dept and our local EPA has been in the back pockets of big business allowing them to dump toxic chemicals into our rivers and leach agent in our back yards for over 20 years, all while they want to soak the little home owner who is simply trying to sell his house and move to a better life.

The HUD changes were specifically meant (check their wording) to address the flagrant fraud involved in the whole ESA scam, and to make the requirements harsher, in fact stating that an online letter, by itself, is not adequate to establish the right for an ESA.Reasons a Landlord can deny an ESA:1) It causes a financial burden2) It causes a potentially dangerous situation3) It causes a hardship to neighbors4) The building is 4 units or less and the landlord lives there5) The property is a SFH rented without the use of an agent6) The ESA has caused significant property damage in the past7) Insufficient or fraudulent documentation is provided8) Illegal breedsHere is a good, fair site for info devoted to landlords: https://landlordgurus.com/emot...

I am a 21 year old rising senior pursuing a chemical engineering degree.

.: manufacturing or distributing illegal substances, storing, manufacturing, or selling explosives, flammables, or other inherently dangerous substances, chemicals, or unlawful devices)."

I think I know the building and there is not much to consider with this type of use: if chemicals were used your lender might require a phase one envirmonmentals study, but I don't think that's the case here.Issue number 2 is that it can take a while to find a new commercial tenant, so while tenants typically stay a very long time, if you have a turn over you may have to spend some money on preparing the space for a different use and it could be some time before you have a new business.

The plumber quoted $900 to jet it out, or $3500 to dig up and replace the pipe.I see there are chemical root treatment options for this that is much cheaper.  

Chemical treatments can mask smells, for awhile.Fire restoration is a specialty and I'll bet the inspectors will be very tough on a new guy breaking into the business.

It's nasty, hot/cold work in confined spaces, heights, noise, chemical pollution, etc. 

He's a mad scientist with water temp, soak time, the chemicals etc.

The individual that did it said they typically last 2-10 years (super wide estimated range) depending on the chemicals that come in contact with the reglazed surface and a few other factors.