heating oil tanks are NOT regulated by EPA. you have to look at your state cleanup standards. 20,000 ppm is significant but the good news is that heating oil tends to be very viscous (unless you were using no. 2 oil) so it may not migrate very far. the cost dramatically increases if you have groundwater contamination and the groundwater is used for drinking water. you need to engage a environmental consultant, not a tank contractor.

Before you plan on in-sourcing dry cleaning; make sure you are well aware of the rules and regulations pertaining to that industry.

The loan limits are established following a weird formula     4.

Shaheen Law Firm, Entity/LLC establishment and closing agent, highly recommended.

If you haven't, I'd reach out to a great lender and start establishing rapport. 

From my research it looks like a very good market for STR demand, cash on cash returns, and STR regulation. 

Be aware though that there are many modular companies and some are more expensive than design/build custom ADUs.I would also agree with with Andrew, a conversion of an existing space (like a garage) might be the cheapest.Also, check with your city laws on what's an allowable ADU to construct based on your current home and rental regulations for them.Collin

I am looking to establish connections and acquire my first property in the area in the near future. 

A little worse numbers could easily result in negative cash flow.I hope everyone who invests in RE uses well established pro forma work sheets (such as the BP calculators) but it is not the case. 

I would love to connect and talk with anyone interested in establishing a potential relationship to acquire a deal.Thank you for your time and support, and I look forward to learning and hearing from this great community.