Seller will be taking a 30k+ loss with this route.325k with 50K down to seller, 3 years of payments $1600/month, and a balloon payment of 215k at the end of 3 years.Benefits to me: (1) 10k less downpayment, (2) with the conventional route, the loan would be at 228k after 3 years of payments, so I will gain additional equity with the 2nd option since I will owe 215k (presumably I will have to refinance at that time).Benefit to seller: she gets over asking price, 50K upfront and $300/month of cash flow.Does this offer and structure sound reasonable?

(if the buyer wants a more solid commitment)Once a buyer has spent money they are somewhat vested in buying the property and that gives additional negotiating power to the seller.

Looking at this as a strategic addition to my portfolio.

@Ryan VienneauAre they able to set-up your credit cards as additional "accounts payable"?    

My biggest concern is managing additional units and tenants.

So you have to weight risk to reward.. and sometimes we have to eat one that we bought it happens..

Additionally, if there are any contractors in the Fort Lauderdale area who can provide an estimate or guidance on this type of conversion, I’d really appreciate the connection!

The unobstructed water views for both front STR units can be challenging to determine additional value compared to other 3-unit properties without views.

IMO this is much too little additional return to put your personal residence at risk.  

Patio door prices can depend on the Model of Patio door you are looking for, for a standard 60x80 in white it will cost $1900.00 colors can be added, and for a patio door 72x80 the cost will be $2100.00 Outswing for a 60x80 will cost $2600.00 installed, and for an outswing 72x80 it will cost $2700.00 installed outswing with Grills for a 60x80 costs $1860.00, and an outswing 72x80 will cost $2300.00 installed.You also add blinds to all sliding and outswing patio doors for an additional charge.