I have no idea if the same type of thing works for wetlands but I looked at a 5 ac. lot that had 3.74 ac. of "dry wash" this type of property is needed when developing land in the surrounding area.  

I can give you referrals for gutter cleaning, window washing, pressure washing, roof cleaning, roof replacement, painting.

Abandoned car wash.

In a podcast the other day, I heard about an investor who repurposed his laundry room into a communal area, transferred water costs to the tenants, installed hookups in all units, and gave them the option to lease a washing machine and dryer for ~$35/month.

Light landscaping,  power wash, take out carpet put hardwood in living room and hall ways,paint cabinets, new front door, that's if we even decided on all that because it's a turn key as is.If we decided to lease were going to do things listed above.

Was he an incorporated Entity or just a guy loaning money out?

I'm sure your taxes will go up, but if you self manage it, then it will be a wash. 

I am looking at purchasing a car wash.

She set up a washing machine to the pipes in the kitchen.

Back then, before laundromats, before wash and wear clothes, people drop off their laundry down the street on their way home from work, not drive a long distance to drop it off.