If there is, any heavy rains will cause water levels to increase upstream and all of that will funnel into the creek downstream-and it won't just be water from one area.  

Single-family home sales jumped 14.3 percent year-over-year, with 4,699 units sold, marking the seventh consecutive month of positive sales;Days on Market (DOM) for single-family homes extended slightly from 66 to 68 days;Total property sales surged 15.2 percent, with 5,800 units sold;Total dollar volume rose 17.1 percent to about $1.6 billion;The single-family home median price increased 4.5 percent to $234,000, reaching a January high;The single-family home average price climbed 4.6 percent to a January high of $291,034;Single-family homes months of inventory was at a 3.5-months supply, down fractionally from 3.6 months last January but above the national inventory level of 3.0 months;Townhome/condominium sales jumped for a second straight month – up 20.9 percent, with the average price down 3.5 percent to $186,582 and the median price down 5.2 percent to $149,750;Lease properties experienced a strong performance, as single-family home rentals climbed 14.5 percent with the average rent up 1.7 percent to $1,782;Volume of townhome/condominium leases rose 5.6 percent with the average rent up 5.9 percent to $1,598.

Note that this is ground level unit and there was a theory at first that external moisture is causing it so we tried to work with the HOA. 

pid=1697Houston Real Estate Highlights in January:-Single-family home sales jumped 14.3 percent year-over-year, with 4,699 units sold, marking the seventh consecutive month of positive sales;-Days on Market (DOM) for single-family homes extended slightly from 66 to 68 days;-Total property sales surged 15.2 percent, with 5,800 units sold;-Total dollar volume rose 17.1 percent to about $1.6 billion;-The single-family home median price increased 4.5 percent to $234,000, reaching a January high;-The single-family home average price climbed 4.6 percent to a January high of $291,034;-Single-family homes months of inventory was at a 3.5-months supply, down fractionally from 3.6 months last January but above the national inventory level of 3.0 months;-Townhome/condominium sales jumped for a second straight month – up 20.9 percent, with the average price down 3.5 percent to $186,582 and the median price down 5.2 percent to $149,750;-Lease properties experienced a strong performance, as single-family home rentals climbed 14.5 percent with the average rent up 1.7 percent to $1,782;-Volume of townhome/condominium leases rose 5.6 percent with the average rent up 5.9 percent to $1,598.

When will it level out?

@Tyrone Osilesi hopefully you'll know what finish level you'll have when you're done so you need to find comparable houses on your own.

Economists are predicting that most US housing markets will begin to level off in the coming year, but Columbus is NOT one of them. 

Close behind are Arizona and South Dakota, where net gains were at roughly 25%.On the opposite side of the spectrum is West Virginia followed by, curiously enough, some of the wealthiest states in the country: New York (-18%), Connecticut (-18%), and Illinois, California and New Jersey (all at -17%).On the city level, New York City, San Francisco, Chicago and Los Angeles all lost more residents than they gained in 2019.

& 10-yr. balloon are favorable and the rate is not too bad considering the level of risk.

How will he be compensated, when his interest is in appreciation, but yours is in long term hold.I would just make sure that there is some level of alignment of interest here, since he won't be compensated until you sell/refi, and the refi may not be as much as he wants, and the sale may never come based on your investment objectives.