In MN the Hoa actually owns the lakefront of my property because they want to ensure equal access and avoid any environmental Fines.  

Here is a list of due diligence item I use on my MHP investments:Check zoning and permitting compliance (city zoning)Check local law compliance (with Sherriff and/or Police)Search City Council minutes for any adverse mentionsCheck with State Department of Public Health's Division of Community Environmental Protection (CEP) for compliance violationsCheck with property neighbors for any disputes or pending legal actions Water - Check with water provider for any open or recent issuesSewer - Check with Sewer provider for any open or recent issues or complaintsElectricity - Check with electricity provider for any open or recent issues Rent roll with space number, name of resident, move-in date, renter or owner occupied, number of occupants, monthly rent, additional charges, current balance due and any relevant notes about the residentList of capital expenditures for the last 3 yearsGet last 2 years of Profit and Loss statementsGet last 2 years of Tax Returns for the LLC/Park12 months of Bank Statements for the LLC/ParkCurrent Accounts receivable statementsBuild proforma for next 5 years using rent roll and expensesGet owed taxes to City/County/Local govGet Insurance Quote of commercial liability insurance2 years of utility billsProperty Tax bills for last 2 years List of park owned home including copies of “rent to own” or sales contractsGet list of vendors and contract status for each vendorTalk with on-site property manager regarding issuesConduct Onsite Property Visit with property managerSpreadsheet detailing who pays all utilities including water, sewer, gas, electric, trash, cable, etc.

Even after paying for a years of insurance, phase one environmental, appraisal and so on...we ended up only having $2100 total out of pocket to close it.

I've been conscious about my finances since graduating from college in 2016, carefully budgeting and researching investment vehicles to ultimately reach financial independence.

Or are there environmental requirements. 

Actually, we’ve been pretty conscious with our spending.

@William HinscheThe most expensive items I’ve seen are:Structural ItemsRoofsFurnace/Air ConditionersLead Paint or any environmental issue

Has anyone purchased or sold a property with DPS (Downgradient Property Status) filed on it, because of environmental contamination from an upstream property?

Obviously there are many variables like impact fees, permitting, soil/environmental fees, and well/septic if needed all above that $120, but that should give you a start.

Making the appraiser aware of your concern will make them conscious of their own bias.