In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

@Colleen F. unfortunately, AFAIK, there is no other resource than go to small claims court and go after her, which will take me $2-3K in additional legal fees.

Then we review the submitted file items and come back with questions or ask for additional documents it is a normal process.

Perhaps you could consider hard money in addition to private money?

Properties below this threshold present additional risks and more limited borrowing options.7.

A less then full investigation may result in one thinking that the house and or the house and tennis court lots were what was being sold.As I later found out, a newbie tax lien investor thought they were getting a great bargain by outbidding other misinformed investors and paying the back taxes, legal fees, and an additional $34,000 (overage) which the county forwarded to me.  

Best to call city hall for the town you are buying in to see what if any rent control rules are in place. see link below if you require additional information and call the Jersey City Landlord Tenant relations office. https://www.jerseycitynj.gov/cityhall/HousingAndDevelopment/...Jersey City CPI chart on recommended rent increases: https://cdnsm5-hosted.civiclive.com/UserFiles/Servers/Server...The state with the highest eviction rate in the country right now is South Carolina. 

In both you are now paying taxes on an additional $1K/mo.

For payments, tools like Stripe, PayPal, or booking software like OwnerRez work well.Happy to connect if you’d like to chat more or need additional tips!

Additionally, you want to start building your "Core 4": agent, GC, lender, and PM.