"In the state of New York, anti-discrimination laws cover most types of housing, with four main exceptions:one- or two-family owner-occupied buildings. room rentals in housing for individuals of the same sex, such as college dormitories or boarding houses where all residents are of the same sex."

I don't know MA laws, so generically:1) Do you need any lead paint, bed bug, or sex offender disclosure? 

Since it’s in a specific area of the city, we are designing it in a U shape which goes well with other buildings in the neighborhood.  

You need more specific city code for a specific site.Rezoning is definitely possible, just adds time and money.I'm a U Miami law grad, still very active in Florida with clients so let me know how I can help.Ron

However, sex workers don’t always come with drug activities.

They are saying it'll report "crimes at a national level like national sex offender list" but that they can't access county or state level offenses.

In my experience these are the levels of how financial fraud is doneLevel 1 - The “sponsor” is a fraudster from the beginning and the entire investment is a designed fraud designed to steal the investor's money Level 2 - The sponsor initially intends to operate legally and honestly but the temptation of easy access to money, usually fueled by addictions to drugs, sex, partying, etc. leads to the bad decision to line the sponsors own pocketsLevel 3 - The sponsor intends to operate legally but a crisis in their life resulting in a need for money leads the sponsor to “borrow” from investor’s funds with the full intention of paying it back ( which they are unable to do).Level 4 - The sponsor intends to operate legally but the assets under their management incur substantial loses; the sponsor attempts to cover up these loses by “temporarily” borrowing from one investor to pay another or submitting false results.

They will sneak in a couple dogs, a second family, or their sex predator boyfriend.

So, we obtaina full credit report and review collections, chargeoffs, age of credit accounts, active accounts, etc.to build an overall credit evaluation.FICO ScorePct of PopulationDefault Probability800 or more13.00%1.00%750-79927.00%1.00%700-74918.00%4.40%650-69915.00%8.90%600-64912.00%15.80%550-5998.00%22.50%500-5495.00%28.40%Less than 4992.00%41.00%Source: Fair Isaac CompanyPublic RecordsWe also obtain data from national databases about evictions, convictions and sex-offender histories.

Violent criminals and sex offenders are high risk.